Thursday
April 24, 2014

Search: An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution

Number of results: 27,833

AP Chemistry
There is an unknown amount of unlabelled monoprotic acid in an unknown amount of water titrated with a sample with a solution of NaOH of unknown molarity. After adding 10.0 mL of NaOH, the pH=5.0. The equivalence point is 32.22 mL of NaOH. What is the Ka? I have been looking ...
Tuesday, March 8, 2011 at 9:58pm by Ben

chemistry
Dissolve 1.5g of an unknown salt into 37g of water and find that the new vapor pressure at 75C is 277 torr. What is the Molar Mass of the unknown? How many grams of the unknown would have to be used in 100ml of water to make a 11.5% solution by mass of the unknown?
Sunday, December 5, 2010 at 5:07pm by regina

chem
(5) In this experiment MnO4-is reduced to Mn 2+ by the unknown. What is the equivalent weight of MnO4- for this experiment? 52.68 (6) How many equivalents of electrons were transferred from the unknown solution? (7) What is the Normality of the 1.00 mL of the unknown solution...
Thursday, October 27, 2011 at 9:43pm by bry

Chemistry
Freezing point of pure water = -2, Freezing point of Unknown solution = -1 Mass of unknown in 50g of water = 1.9964g. Calculate the delta T for the solution of the unknown solid and determine the molecular weight of the unknown solid.
Saturday, February 2, 2013 at 11:39pm by Anna

thermochem
An unknown volume of water at 18.2C is added to 27.0 mL of water at 36.7C. If the final temperature is 23.5C, what was the unknown volume? (Assume that no heat is lost to the surroundings; d of water is 1.00 g/mL.)
Sunday, October 5, 2008 at 1:03pm by james

ap chemistry
A 0.456 gram sample of an unknown mono- protic acid (lets call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH. What is the molecular weight of the unknown acid HZ? 1. 103.2 g...
Tuesday, March 5, 2013 at 8:13pm by cheri

AP Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
Sunday, February 24, 2013 at 2:42pm by Sarah

Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
Sunday, February 24, 2013 at 8:42pm by Kat

Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
Sunday, February 24, 2013 at 9:19pm by Summer

mat 116
two large storage tanks, T and W contain water. T starts losing at the same time additional water starts flowing into W. The graph below shows the amount of water in each tank over a period of hours. Assume the rates of water loss ad water gain continues as shown. At what ...
Sunday, March 2, 2014 at 9:15am by csrla

Chemistry
The vapor pressure of water at 95C is normally 6.33.9 but decreased to 561.2mmHg upon addition of an unknown amount of NaOCl to 164.3g of water at this temp. How many grams of NaOCl was added assuming complete dissociation of the solute
Saturday, April 23, 2011 at 5:52pm by Jay

Chem
a solution containing 100g of unknown liquid and 900g water has a freezing point pf -3.33 C. given kf=1.86 degrees c for water, the moelcular weight of the unknown liquid is what?
Sunday, February 12, 2012 at 10:45pm by Court

chemistry
The procedure described in this experiment was used to determine the molar mass of unknown liquid (non-electrolyte). The solution was made by mixing 0.961 g of the unknown with 100.0 g of water. The freezing point depression of the solution was −3.7C. Calculate the ...
Thursday, April 19, 2012 at 2:39am by hereyago

Chemistry
A mass of 0.200 kg of an unknown metal at 94C is placed in 0.3 kg of water at 10C. The final temperature of the metal and water are 20C. What is the specific heat capacity of the unknown metal?
Wednesday, October 20, 2010 at 12:06pm by Cas

Chemistry
The vapor pressure of pure water at 85 celsius is normally 433.6 mmHg but decrease to 393.8mmHg upon addition? of an unknown amount of ammoniu chloride NH4Cl to 162.2g of water at this temperature. How many grams of ammonium chloride were added assuming complete dissociation ...
Sunday, February 20, 2011 at 6:11pm by Jude

Chemistry
The water loss by the sample, and the precent by weight of the water in the unknown hydrates 34.78%H2O. which of the ten possible hydrates are the most likely ones to be your unknown based on the percent by weight?
Sunday, April 7, 2013 at 4:17pm by judy

Urgent - Physics
The U-shaped glass tube in the figure below contains two liquids in mechanical equilibrium: sea water of density 1.025 kg/L, and an unknown liquid of density ρ. The unknown liquid is in the left tube, floating on top of the water with a clearly visible interface. Use h1...
Tuesday, January 27, 2009 at 12:42am by Jen

Chemistry
When 1.150 grams of an unknown nonelectrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16C. What is the molecular weight of the unknown compound? Kf for water = 1.86C/m. -2.16 x m/-1.86 = 1.16 1.16/ .010 kg of water= 116 1.150/116= 9.91 g/mol is the ...
Sunday, February 10, 2013 at 5:52am by Marcus

chemistry
A solution which contains 40.3 g of an unknown molecular compound in 360 g of water freezes at -5.07C. What is the molar mass of the unknown?
Monday, November 26, 2012 at 10:35pm by paul

Chemistry
An unknown metal, heated to an unknown temperature until a liquid is dropped into a calorimeter that has 250 ml of water. The water heats up from 22 degrees Celcius to 29 degrees Celcius, at which point the temperature of the water and metal are equal. How much energy in ...
Saturday, December 4, 2010 at 10:10pm by Ivy

Chemistry I
An unknown volume of water at 18.2 degrees celsius is added to 24.4 mL of water at 35.0 degrees celsius. If the final temperature is 23.5 degrees celsius what was the unknown volume? (assume no heat is lost to surroundings and D of water is 1.00g/mL)
Sunday, October 12, 2008 at 6:16pm by Kelsie

Chemistry
Calculate amount (in grams) of unknown acid used for titration. You want 30 mL of titrant to get the equivalence point. Assume that the base is 0.05 M and the unknown acid molar mass is around 400 g/mol.
Saturday, March 23, 2013 at 1:37pm by Justine

physics
A column of water of height h1 = 70.0 cm supports a column of an unknown liquid h2 = 30.0 as suggested in the figure (not drawn to scale). Assume that both liquids are at rest and that the density of water is 1.0x103 kg/m3. Determine the density of the unknown liquid.
Sunday, January 17, 2010 at 8:05pm by sara

College Chemistry
The Water loss by the sample, and the percent by weight of water in the unknown hydrates is 34.78%H2O. which of the ten possible hydrates are the most likely ones to be your unknown based on the percent by weight?
Sunday, April 7, 2013 at 4:27pm by judy

Gen. Chem
Could you help me with this homework please.. 105.0 g of water is in a Styrofoam calorimeter of negligible heat capacity. The initial T of the water is 17.1oC. After 288.2 g of an unknown compound at 77.0oC is added, the equilibrium T is 25.1oC. What is the specific heat of ...
Monday, March 25, 2013 at 8:04pm by carl

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
Sunday, March 31, 2013 at 2:24pm by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
Sunday, March 31, 2013 at 1:44pm by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
Sunday, March 31, 2013 at 3:36pm by jeff

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
Sunday, March 31, 2013 at 4:37pm by jeff

university of calabar
A stoppered flask at 25 0C contains 250 ml water, 200 ml octanol, and 50 ml of air. An unknown amount of o-xylene is added to the flask and allowed to partition among the phases. After equilibrium has been established, 5.0 mg of o-xylene are measured in the water. What is the ...
Thursday, March 27, 2014 at 12:52pm by gift

Chemistry
I'm doing an Equivalent Weight and Normality experiment and I got very confused on the discussion questions.[ the unknown is titrated with the KMnO4] 1) In this experiment MnO4- is reduced to Mn2+ by the unknown. What is the equivalent weight of MnO4- for this experiment. ...
Sunday, April 6, 2008 at 1:39pm by Confused

science need help
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
Monday, April 1, 2013 at 9:54am by jeff

science need help
2 H2 + O2 = 2H2O 2 grams + 32 grams=_ _ _ _ _grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogeb that reacts. in your response be sure to: include they type of change illustrated in the balanced eqaution explain the conservation ...
Monday, April 1, 2013 at 11:15am by jeff

chemistry
A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound? Below is what I tried, but don't know what to do next. Please explain step-by-step. ...
Friday, October 11, 2013 at 3:33am by Anonymous

Chemistry
Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 4.92 mL of O2 had passed through the membrane, but only 3.04 mL of of the unknown gas had ...
Tuesday, April 15, 2014 at 10:21pm by Peter

chemistry
If the atmospheric pressure is not corrected for vapor pressure of water, what effect will this have on number of moles of oxygen calculated? Use numbers from your experiment and determine the percent deviation caused by this omission. Is this a significant error? this is a ...
Friday, September 3, 2010 at 12:37pm by Anonymous

Physics Homework
A 2000 lb box is being held at rest submerged in water. The box is displacing 2500 lbs of water. When the box is released from its submerged position, the box will a. sink b. rise to the surface and float c. remain where it is d. result unknown Ok, so if the box is put in the ...
Saturday, November 13, 2010 at 7:45pm by Jael

Physics - Buoyant Force
A piece of metal weighs 50.0 N in air, 36.0 N in water, an 41.0 N in an unknown liquid. Find the density of the unknown liquid.
Tuesday, December 16, 2008 at 12:15am by Phillip

College Chemistry
Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass? The sample is 2.763 grams How much of the 2.763 gram sample is water? I need an amount in grams. Amount of anhyrdate...
Saturday, October 8, 2011 at 9:01am by Roy

Chemistry
A 0.750 g sample of an unknown solid is dissolved in 100 mL of water and acidfied with 25 mL of 3 M H2SO4 then titrated with a 0.0200 M KMnO4 solution. If the unknown solid requires 12.5 mL of the KMnO4 solution to reach the endpoint, what is the % sodium oxalate in the ...
Tuesday, April 9, 2013 at 3:54pm by Aaron

Chemistry
A water solution containing an unknown quantity of an unknown nonelectrolyte solute has a freezing point of -0.21 Celsius. What is the molality of the solution? Kf=-1.86C/m
Thursday, May 12, 2011 at 1:11am by Anonymous

math
A supersoaker water pistol can hold up to 4 litres of water. If each shot uses 11/12 of amount of water of its previous shot, the amount of water fired by a fully loaded supersoaker's first shot is? x/4000ml=11/12 x=3666.7mL why is the answer 333mL?
Saturday, January 9, 2010 at 5:17pm by cyn

Science-Chemistry
1.)A sample of oxygen took 55 seconds to travel a certain distance. How long would it take for the same number of moles of nitrogen to travel the same distance. 2.) A sample of hydrogen gas traveled 45m in a given amount of time. An unknown gas traveled 7.6m in the same amount...
Sunday, April 29, 2012 at 3:36pm by Bryan

Chemistry
In an experiment, 3.545 grams of an unknown nonelectrolyte is dissolved in 15.0 grams of water. The extrapolated freezing point is -.56 degrees C. What is the molecular weight of the unknown material?
Monday, November 22, 2010 at 7:43pm by Cerra

Chemistry
At 20 degree celsius, Ka for an unknown monoprotic weak acid is 0.00088. Calculate the Delta G (in kJ/mol) for the reaction of this unknown acid with water. HA(aq) + H2O(l) <--> H3O+(aq) + A-(aq)
Tuesday, April 30, 2013 at 1:00am by Chloe

organic chem
7. An unknown compound, C8H14, is optically active. Hydrogenation of the unknown yields 4-methylheptane. Ozonolysis of the unknown yields ethanol and 2- methylpropandial. Suggest a structure for the unknown consistent with the above date. please help
Monday, October 11, 2010 at 9:59am by josh

Chemistry
1. Mass of flask, boiling chips, foil cap and unknown after cooling reaction 83.350g 2.Mass of flask, boiling chips,and foil cap. 82.657 3. water bath temperature C is 95.0 C 4. Barometric pressure inches of Hg 30.09 5. Accepted molar mass of unknown is 86.2g/moles 6. Volume ...
Monday, June 14, 2010 at 1:48pm by Anonymous

Chemistry
Mass of flask, boiling chips, foil cap and unknown after cooling reaction 83.350g 2.Mass of flask, boiling chips,and foil cap. 82.657 3. water bath temperature C is 95.0 C 4. Barometric pressure inches of Hg 30.09 5. Accepted molar mass of unknown is 86.2g/moles 6. Volume of ...
Monday, June 14, 2010 at 1:48pm by Anonymous

chemistry
an aqueous solution containing 17.5g of an unknown molecular(nonelectrolyte) compound in 100.0g of water has a freezing point of 1.8 degress C. calculate the molar mass of the unknown compound
Saturday, November 5, 2011 at 10:05am by Monique

Chemistry
A 0.160-g sample of unknown metal (X) reacts with hydrochloric acid to produce 66.5 mL of "wet" gas at 20 C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 C is 18 mm Hg. Help please?
Wednesday, April 23, 2014 at 3:44pm by Ally

Science
Working on the Amazon River, a biologist isolated DNA from two unknown organisms, P and Q. He discovered that the adenine content of P was 15% and the cytosine content of Q was 42%. This means that: a) the amount of guanine in P is 15% b) the amount of guanine and cytosine ...
Tuesday, October 26, 2010 at 12:16pm by May

Chemistry
A 0.188g sample of unknown metal, X (s), produced 71.4 ml of hydrogen gas when reacted with HCL according to the equation: X(s)+2HCL(aq)--->XCl2(aq)+H2(g) The gas was collected over water at 23 degrees Celsius. The levels of water inside and outside the gas collecting tube ...
Thursday, February 10, 2011 at 1:31am by K

Accounting
An estimated liability: 1. Is an unknown liability of a certain amount. 2. Is a known obligation of an uncertain amount that can be reasonably estimated. 3. Is a liability that may occur if a future event occurs. 4. Is not recorded until the amount is known for certain. (...
Tuesday, April 1, 2014 at 2:41am by Jessica

Chemistry
An aqueous solution containing 17.1 g of an unknown molecular compound ( nonelectrolyte) in 105.0g of water was found to have a freezing point of -1.8 degrees Celsius. What is the molar mass of the unknown compound?
Friday, December 6, 2013 at 4:35am by John

physics
In lab, Will burns a 0.6 g peanut beneath 48 g of water, which increases in temperature from 22 degree C to 55 degree C. The amount of heat absorbed by the water can be found with the equation Q =cm \Delta T, where Q is the amount of heat, c the specific heat of water, m the ...
Saturday, March 31, 2012 at 7:39pm by christy

science(chemistry) -Q for Dr.Bob
solvent layer: 1 solid precipitate: no I ran the solvent layer I got in my unknown in the GC and I had sharp peaks in the beginning but at about 4 min on the polar column, I got a broad peak that tailed off considerably. question is, Is it water? I'm not sure how water would ...
Monday, April 20, 2009 at 11:56pm by ~christina~

Chemistry
If a piece of metal at -20 degrees Celsius is added to an ice and water mixutre in equilibrium at 0 degrees Celsius, which of the following statements is true??? ( Note more than one can be correct) I. the amount of ice will increase II. the amount of water will decrease III. ...
Sunday, April 22, 2007 at 4:34pm by John

Chemistry
If a piece of metal at -20 degrees Celsius is added to an ice and water mixutre in equilibrium at 0 degrees Celsius, which of the following statements is true??? ( Note more than one can be correct) I. the amount of ice will increase II. the amount of water will decrease III. ...
Sunday, April 22, 2007 at 6:51pm by John

chemistry
1. Mass of flask, boiling chips, foil cap and unknown after cooling reaction 83.350g 2. Mass of flask, boiling chips and foil cap. 82.657 3. water bath temperature C 95.0 C 4. Barometric pressure in Hg 30.09 5. Accepted molar mass of unknown 86.2g/moles 6. Volume of flask 270 ...
Monday, June 14, 2010 at 12:42pm by Patty

Chemistry. please help
A 0.12 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.10 M) was used to titrate the sample, and 18 mL was required to reach the endpoint. What is the formula weight of the unknown?
Wednesday, December 8, 2010 at 8:42pm by Stephanie

Chemistry
An unknown amount of water is mixed with 310 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 58.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M What volume of water ...
Monday, March 19, 2012 at 12:27am by ag

Chemistry
An unknown amount of water is mixed with 310 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 58.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M What volume of water ...
Monday, March 19, 2012 at 12:28am by ag

Chemistry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 51.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M What volume of water ...
Monday, May 13, 2013 at 6:07pm by Anonymous

Chemistry
Calculate the molar mass of a compound that raises the boiling point of water to 100.15oC when 40.5 g of the compound is dissovled in 500 g of water. and A mass of 41 g of an unknown nonelectrolyte is dissolved in 429 g naphthalene. The nonelectrolyte lowers naphthalene's ...
Wednesday, April 30, 2008 at 11:49am by Zachary

Chemistry II
An unknown solute (a nonelectrolyte) was obtained and 5.37 g was weighed out. After dissolving the solute in water, the mass of the solution was 26.58 g. From the experimental results, the freezing point depression was found to be 3.6oC. If the freezing point depression ...
Tuesday, September 8, 2009 at 8:43pm by Lindsay

Chemistry
Help please: A 0.199-g sample of unknown metal (X) reacts with hydrochloric acid to produce 88.5 mL of "wet" gas at 20 C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 C is 18 mm Hg.) X(s) + 2 HCl(aq) → XCl2(aq) + H2(g) (Would Mg be ...
Thursday, April 17, 2014 at 10:05pm by Ally

chemisry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of M
Wednesday, September 19, 2012 at 5:06pm by cheri

AP Chemistry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M
Wednesday, September 11, 2013 at 6:18pm by Gabriella

CHEMISTRY
n unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52 . 5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of M
Friday, October 18, 2013 at 1:38pm by Maria

problem solving
The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 21 minutes requires 12.6 gallons of water. Find the amount of water used for a shower lasting 10 minutes.
Sunday, February 20, 2011 at 4:28pm by Jam

math
In vanessa's coin bank there are 4 times as many quaters as nickels, 2 fewer dimes than nickels, and 15 pennies. the total amount in the bank is $5.80. How many of each coin are in the bank? assign a variable to unknown and write an equation to find unknown.
Tuesday, July 24, 2012 at 9:57pm by Niki

CHEMISTRY
A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound?
Friday, October 11, 2013 at 9:36am by NEHE

chemistry
i am calculating an unknown acid for both monoprotic and diprotic assumptions. I calculated the monoprotic by multiplying the M NaOH by the liters of NaOH used to titrate. 0.0984M x 0.02396= 0.00236. I then take the unknown sample weight and divide it by the previous number to...
Monday, October 25, 2010 at 5:25pm by nicole

AP Chem
I missed a lab in class a week ago and had to make it up just the other day. My teacher didn't have time to explain the lab to me, so he gave me a brief overview of the procedure. The objective of the lab was to calculate the specific heat of an unknown block of metal. The ...
Thursday, February 8, 2007 at 3:38pm by Jess

Chem9
An aqueous solution containing 35.1 grams of an unknown molecular (noneolectrolyte) compound in 152.5 grams of water was found to have a freezing point of -1.8 degrees C. Calculate the molar mass of the unknown compound.
Monday, May 2, 2011 at 11:43pm by Ryan

Chemistry
Hello, we recently did a lab in our chemistry class to analyze an Unknown amount Calcium Carbonate which was titrated with EDTA. Our titration results were: mass of the unknown CaCO3 was 0.172 g and the mL of EDTA added was 30.7. How do I find the percent mass of Ca?
Thursday, July 1, 2010 at 1:59am by Anna

chemistry
When 86.7 g of water at a temperature of 73 C is mixed with an unknown mass of water at a temperature of 22.3 C the final temperature of the resulting mixture is 61.7 C. What was the mass of the second sample of water? (Specific heat of water 4.184 Jg-1C-1)
Tuesday, April 9, 2013 at 8:15am by Anonymous

chemistry
When 86.7 g of water at a temperature of 73 C is mixed with an unknown mass of water at a temperature of 22.3 C the final temperature of the resulting mixture is 61.7 C. What was the mass of the second sample of water? (Specific heat of water 4.184 Jg-1C-1)
Tuesday, April 9, 2013 at 11:26am by Anonymous

chemistry
A sample of 0.6760 g of an unknown compound containing barium ions (Ba2+) is dissolved in water and treated with an excess of Na2SO4. If the mass of the BaSO4 precipitate formed is 0.1405 g, what is the percent by mass of Ba in the original unknown compound?
Wednesday, September 29, 2010 at 2:16am by Michael

Chemistry
50 grams of water at 85C were passed through one side of a two-compartment heat exchanger. Sixty-five grams of 30C were passed through the other side. Both streams of water came out at 50C Calculate the amount of heat given up by the hot water and the amount absorbed by the...
Wednesday, March 13, 2013 at 1:13am by Sarcasticqueen

Chemistry
What are the typical ppm values of hard water and an unknown water sample and how do their titrations compare?
Wednesday, March 12, 2014 at 3:13am by Jacob

Chemistry
The vapor pressure of pure water at 90celsius is normally 525.8 but decreased 483mmHg upon addition of an unknown amount of KNO3 to 286.9g H2O at this temperature. how many grams KNO3 were added. ASSUME COMPLETE DISSOCIATION OF SOLUTE. Tried all solutions provided and still ...
Sunday, April 24, 2011 at 2:33am by Jude

physical science
A builder pushes a wheelbarrow loaded with sand ,from rest at point A,up a ramp of unknown length ,which is inclined at unknown angle ,vertical height of unknown 2,75m
Sunday, April 7, 2013 at 8:05am by lucky

Math PLZ HELP!!!!
A tank that holds 4000 gallons of water will drain completely into a reservoir in 32 minutes. The volume of remaining water in tank after time t is given by the function: V(t)=4000(1-t/32)^2, 0<t<32 The amount of water in reservoir depends on how much water has drained ...
Wednesday, December 18, 2013 at 2:21am by Jessy

Chemistry
Expt #1- Molecular Weight of Unknown Acid Unknown Acid: #2 Mass of Unknown solid acid transferred:0.414g Volume of volumetric flask: 100.00 mL Concentration of NaOH: 0.0989 M Aliqot of acid titrated with NaOH: 25.00 mL Average volume of Naoh from titration: 13.9 mL Here's ...
Sunday, October 10, 2010 at 6:48pm by Rayana

chemistry
10.0mL of solution containing 20.0 mL of 1.0 M NaX (unknown base) and 10.0 mL of 1.0 M HX (unknown acid) was diluted with 50.0 ml water. The pH is 4.92. What is the concentration of HX after dilution and X- after dilution? What is the equilibrium concentration of HX, X-, and ...
Saturday, February 27, 2010 at 7:53pm by kelly

chemistry
if the ration of water drops to EDTA is 6.7 for the known sample and 10 for the unknown sample what is the concentration of the unknown sample? (The concentration of the known sample is 315 ppm) a. 150mg/L b. 210mg/L c. 280mg?L d. 320mg/L
Wednesday, May 12, 2010 at 12:38pm by alex

Chemistry
A 0.125-g sample of monoprotic acid of unknown molar mass is dissolved in water and titrated with 0.1003 M NaOH. The endpoint is reached after adding 20.77 mL of base. What is the molar mass of the unknown acid?
Monday, January 4, 2010 at 4:09pm by coug

organic chemistry
Determine the percent composition of your unknown mixture. My data for refractive indexes for acetone is 1.365 and water is 1.330. This is what my unknown mixture was composed of. How do I use this info to find percent composition of each compound?
Saturday, November 8, 2008 at 12:45pm by Jenn

chemisry
A 0.125 gram sample if a monoprotic acid of unknown molar mass is dissloved in water and titrated with 0.1003 MNaOH. The endpoint is reached after adding 20.77 ml of base. What is the molar mass of the unknown acid?
Tuesday, May 4, 2010 at 10:57am by janny

college Chemistry
1. If 25 grams of Iron (III) hydroxide is dissolved in a 500mL volumetric flask, what is the Molarity of the solution? 2. An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What is the weight of the metal in grams? 3. An unknown metal, heated to an unknown ...
Saturday, December 4, 2010 at 5:46pm by Ivy

AP Chemistry
A 34.05 gram liquid sample of an unstable compound is deposited in a metal piston assembly that has a cylinder with a diameter of 20.0 cm. After the sample is added, the piston is placed in contact with the liquid and the piston vent is closed. This process removes all ...
Wednesday, September 26, 2012 at 9:39pm by Jack

Physics
A 0.260-kg piece of aluminum that has a temperature of -165 C is added to 1.4 kg of water that has a temperature of 3.0 C. At equilibrium the temperature is 0 C. Ignoring the container and assuming that the heat exchanged with the surroundings is negligible, determine the ...
Friday, November 17, 2006 at 7:54pm by Sara

Chemistry
When 112 g of water at a temperature of 22.5C is mixed with 65.1 g of water at an unknown temperature, the final temperature of the resulting mixture is 46.3C. What was the initial temperature of the second sample of water?
Friday, October 8, 2010 at 11:28pm by Noelle

chemistry
STANDARD: Put into a clean 250 mL volumetric flask exactly ..... 0.90 ml of 1.00 mM iodate STANDARD. Add an excess of 1M KI and 1M Sulfuric Acid and let stand for 5 minutes. Dilute to volume. UNKNOWN: Pipet into a clean 250 mL volumetric flask 1.00 mL of your UNKNOWN and ...
Sunday, July 28, 2013 at 7:33pm by faruk

Chem
264.6 g of water is in a Styrofoam calorimeter of negligible heat capacity. The initial T of the water is 16.9oC. After 270.9 g of an unknown compound at 71.3oC is added, the equilibrium T is 33.2oC. What is the specific heat of the unknown compound in J/(goC)? I did: 270.9(33...
Monday, March 18, 2013 at 4:57pm by Anonymous

Chemistry
If 0.1g of Unknown chloride reacts with 0.164 g of AgNo3 to form 0.05g of Agcl and unknown Nitrate.How do we find Unknown chloride?
Saturday, October 8, 2011 at 9:36pm by Veena

PHYSICS
In lab, Will burns a 0.6- peanut beneath 48 of water, which increases in temperature from 22 to 46. The amount of heat absorbed by the water can be found with the equation , where is the amount of heat, the specific heat of water, the mass of water, and the change in the water...
Tuesday, April 23, 2013 at 4:13pm by Ericca

Chemistry
I did a lab for Organic Chemistry We did a simple distillation of an unknown alcohol to determine the boiling point, which was found to be 74*C The four possibilities for the unknown were methanol, ethanol, 1-propanol and 2-propanol. So from the boiling point the unkown must ...
Tuesday, October 5, 2010 at 10:22pm by Laura

Chemistry - Please help!!
I did a lab for Organic Chemistry We did a simple distillation of an unknown alcohol to determine the boiling point, which was found to be 74*C The four possibilities for the unknown were methanol, ethanol, 1-propanol and 2-propanol. So from the boiling point the unkown must ...
Tuesday, October 5, 2010 at 11:41pm by Laura

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