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July 3, 2015

Search: A 130.0 mL sample of a solution that is 3.0×10-3 M in AgNO3 is mixed with a 225.0 mL sample of a solution that is 0.13 M in NaCN. After the solution reaches equilibrium, what concentration of Ag+(aq) remains?

Number of results: 60,739

Chemistry
Calculate the pH of the solution that results from mixing 30.0 mL of 0.050 M HCN(aq) with 70.0 mL of 0.030 M NaCN.
March 19, 2014 by Anonymous

college stat
Use the graphic to show the sampling distributions of means for the sample from Prison A (n=82) and the sample from Prison B (n=37). Mark the expected value of the mean and the standard units. Shade in the critical zone for alpha = .05.Locate each sample mean after you have ...
July 24, 2012 by sammy

Chemistry
Calculate the concentration, in molarity, of a solution prepared by adding 9 mL of water to 1 mL of 0.1 M HCl solution. If 2.0 mL of 0.010 M NaOH is mixed with enough water to make the total volume 8 mL, what is the molarity of the resulting solution?
October 3, 2011 by Nico

Chemistry
A solution is prepared by dissolving 15.6 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.00 mL sample of this stock is added to 52.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final solution. I know ...
May 4, 2010 by Anonymous

Chemistry
Suppose that 50.0 mL of a 0.250 M HCl solution is mixed with 50.0 mL of a 0.100 M Ba(OH)2 solution in a coffee-cup calorimeter. The temperature of the resulting solution increases by 1.76 oC . Calculate DH for the reaction between HCl (aq) and Ba(OH)2 (aq) in kJ per mole of Ba...
November 15, 2014 by Mahnoor

Analytical chemistry
Below i wrote a few problems, i did them all but in the book i don't have results, so i don't know if i did them right or not. I would really appreciate if someone would go through the problems and tell me if i got the right results. If i made a mistake somewhere please let me...
August 3, 2013 by Gloria

math
a pharmacist mixed some 10% saline solution with some 15% saline solution to obtain 100ml of a 12%saline solution.How much of 10% saline solution did the pharmist use in the mixture.dO NOT UNDERSTAND TO MUCH INFO.
May 6, 2010 by Anonymous

Chem
AgNO3 solutions are often used to plate silver onto other metals. What is the maximum amount of silver in grams that can be plated out of 4.2L of an AgNO3 solution containing 3.1% Ag by mass?
April 18, 2014 by Marianella

Chemistry
A sample of CuSO4*5H2O was heated to 110 degrees C, where it lost water and gave another hydrate of copper (II) ion that contains 32.50% Cu. A 98.77-mg sample of this new hydrate gave 116.66 mg or barium sulfate precipitate when treated with barium nitrate solution. What is ...
June 11, 2009 by Help Please!!!!!!

chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. Please provide steps (assume volume is same ...
February 17, 2010 by anonymous

chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 % sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. Please provide steps (assume volume is ...
February 17, 2010 by anonymous

math
a 5% acid solution is mixed with a 9% acid solution. How many ounces of each solution are needed to obtain 40 ounces of a 6% solution?
February 27, 2014 by lola

Chemistry
A 60.0ml 0.513M glucose solution is mixed with 120.0ml of 2.33 M glucose solution. What is the concentration of the final solution. assume volumes are additive.
March 13, 2010 by Adam

Calabasas HS
A 46.2-mL, 0.568 M calcium nitrate [Ca(NO3)2] solution is mixed with 80.5 mL of1.396 M calcium nitrate solution. calculate the concentration of the final solution
September 28, 2010 by Michael

Chemistry
A solution is prepared by diluting 65.0 mL of 0.175 M methylamine, CH3NH2, to a total volume of 225 mL. Calculate the pH of the diluted solution. Kb (CH3NH2) = 4.40 x 10-4
June 26, 2011 by Mallory

calc
The half-life of polonium is 139 days, but your sample will not be useful to you after 95 % of the radioactive nuclei present on the day the sample arrives has disintegrated. For about how many days after the sample arrives will you be able to use the polonium? you want to ...
April 10, 2007 by barb

Chemistry
One commercial method used to peel potatoes is to soak them in a solution of NaOH for a short time, remove them from the NaOH, and spray off the peel. The concentration of NaOH is normally in the range of 3 to 6 M. The NaOH is analyzed periodically. In one such analysis, 45.7 ...
January 12, 2011 by Chin

holy school
CaCO3 + H2 SO4 ------> CaSO4 + CO2 + H2 O 200 g of calcium carbonate are added to 4 L of water. a. What is the molarity of the calcium carbonate solution? b. How many moles of hydrogen sulfate would be needed to react with a 25 mL sample of the calcium carbonate solution? c...
March 3, 2013 by mamta

STAT
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 15 and a sample standard deviation 6 and a sample size of 18. Machine 2 has a sample mean of 12 and a sample standard deviation of 6 with a sample size of 18. With an...
October 4, 2013 by Tammy

chemistry
The urine excreted by an adult patient over 24 hours was collected and diluted to give 2.000L sample. at ph 10 EDTA FORMS 1:1 COMPLEX WITH BOTH Mg2+ and Ca2+ and after buffering at this pH a 10mL aliquot of the sample required 26.81mL of 0.003474M EDTA for titration The ...
March 12, 2012 by jenny

Chemisty
A 2.5 L volume of sodium hydroxide solution was prepared. The titrant was standarized against primary standard oxalic acid dihydrate, H2C2O4*H2O(molar mass is 126.06) if a 0.4774g sample of the prmiary standard consumed 31.94mL of the base solution in reaching the ...
May 9, 2012 by Brittany

Chemistry
2NaF + CaCl2 CaF2 + 2NaCl An excess of 0.20 M NaF is used to precipitate the calcium ions from a 50.0 mL sample of a calcium chloride solution. What is the concentration of the original calcium chloride solution?
July 10, 2011 by Neha

Chemistry 2
In a study designed to prepare new gasoline resistant coatings, a polymer chemist dissolves 6.053g of poly in enough water to make 100.0 mL of solution. At 25C, the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer sample?
March 26, 2010 by Mike

chemistry
A student adds 25.00mL of distilled water to a 10.00mL sample of HCl of an unknown molarity and titrates this against a 0.085M NaOH solution. Will the addition of the water interfere with the determination of the molarity of the HCl sample? Why or why not?
October 28, 2014 by xx

chemistry
10). What is the molarity of an HCl solution if 42.5 mL of a 0.110 M KOH solution is needed to titrate a 25.0-mL sample of the acid? A) 0.187 M HCl B) 0.587 M HCl C) 0.0647 M HCl D) 5.35 M HCl E) 1.70 M HCl
November 28, 2011 by denis

Chemistry
if 50 ml of a solution of ph 3 is mixed with 50 ml of a solution of 5, explain why the resulting ph is still about 3 and not 4?
June 17, 2014 by Abdulhafiz

math
A 70% acid solution is to be mixed with a 40% solution. How many gallons of each solutions are needed?
October 2, 2014 by phil

chemistry
A sample containing 0.0500mol of Fe2(SO4)3 is dissolved in enough water to make 1.00L of solution. This solution contains hydrated SO4 2- and Fe(H2O)6 3+ ions. The latter behaves as an acid: Fe(H2O)6 3+ --> Fe(H2O)5OH 2+ + H+ a) Calculate the expected osmotic pressure of ...
February 16, 2011 by Chris

Chem - Molarity
Hi, I have this question related to Molarity and hoping you can help? The question says: 50.0 gram sample of NaCl is added to water to create a 0.50 L solution. What volume of this solution is needed to create a 1.30 L solution that is 0.100 M NaCl? It says also "Choose the ...
April 22, 2015 by Cassandra

Chem 1A
A 15.00 g sample of an ionic compound NaA, where A- is the anion of a weak acid, was dissolved in enough water to make 100.0 mL of solution and was then titrated with 0.100 M HCl. After 700.0 mL of HCl was added, the pH was 5.00. The experimenter found that 1.40 L of 0.100 M ...
March 15, 2012 by Ashley

Chemistry Damon step by step for me
you are given a solid that is a mixture of na2s04 and k2s04. A 0.215g sample of the mixture is dissolved in water. An excess of an aqueous solution of bacl2 is added. The bas04 that is formed is filtered, dried and weighed. Its mass is 0.299g. What mass of s04 ion is in the ...
January 12, 2014 by Ken Hung

Analytical Chemistry
why is it necessary to store AgNO3 solution in an amber bottle? Why must volhard titration be carried out in strongly acidic medium? Why is titration of AgNO3 with KSCN be done with vigorous swirling?
July 25, 2008 by anonymous

Chemistry
The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration 34.67 mL of the ...
October 7, 2014 by melbell

chemistry
Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to a solution. Is this how you would do this? (100/25) = 0.693 times (45.1) 4= 31.2543 final answer is 7.8136
May 11, 2015 by Student101

chemistry
when 0.50 L of a 1.0 M solution of Pb (No3)2 is mixed with 0.50 L of a 1.0 M solution of KI, how many moles of lead (III) iodide are formed?
May 27, 2010 by strid

chemistry
how can I find the Liters of solution. the solution is salt (NaCl) mixed in water (H20) ?
March 25, 2013 by kezinch

Chemistry
A 100.0 mL sample of 0.20M HF is titrated with 0.10M KOH. Determine the pH of the solution after the addition of 100.0 mL of KOH. The Ka of HF is 3.5 x 10^-4
April 7, 2011 by Alex

Chemistry
A student is given a sample in lab which contains one of the ions listed below. After adding a few drops ofsolution to part of the unknown sample, the student got a greyish precipitate. After adding a few drops ofsolution to another part of the unknown sample the student got a...
March 30, 2010 by Evelyn

analytical chemistry
What volume (in liters) of 0.96 M KOH solution should be added to a 0.130 L solution containing 10.2 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 9.90?
March 27, 2014 by joi

calculus
What quantity of 65 per cent acid solution must be mixed with a 25 percent solution to produce 384 mL of a 50 per cent solution?
January 22, 2010 by Julie

Chemistry
A volume of 45.3mL of .719 M Ca(NO3)2 solution is mixed with 82.3mL of 1.409M Ca(NO3)2 solution calculate the concentration of the final solution
October 10, 2010 by Jorge

MATH word prob!
how many gallons of 70% alcohol solution must be mixed with 30 gallons of 23% solution to obtain a solution that is 60% alcohol? How do I solve this problem?
September 9, 2014 by Anonymous

Chemistry
A student is given a sample in lab which contains one of the ions listed below. After adding a few drops ofsolution to part of the unknown sample, the student got a greyish precipitate. After adding a few drops ofsolution to another part of the unknown sample the student got a...
April 6, 2010 by Sam

chemistry
A 13.0 mL sample of an unknown HClO4 solution requires titration with 25.2 mL of 0.180 M to reach the equivalence point. What is the concentration of the unknown HClO4 solution? The neutralization reaction is as follows: HClO4 +NaOH ===>> H2O +NaClO4
November 2, 2010 by john

chemistry
The urine excreted by an adult patient over 24 hours was collected and diluted to give 2.000L sample. at ph 10 EDTA FORMS 1:1 COMPLEX WITH BOTH Mg2+ and Ca2+ and after buffering at this pH a 10mL aliquot of the sample required 26.81mL of 0.003474M EDTA for titration The ...
March 12, 2012 by TOM

Chemistry
A 16.48 g sample of potassium permanganate is dissolved in a 250.0 mL volumetric flask. A 125.1 mL sample of the potassium permanganate solution is added to 75.3 mL of 5.110 M hydrobromic acid in which 32.3 mL of ethanol has been dissolved (d = 0.7891 g/mL) in 3.337 L sealed ...
December 15, 2010 by Millie

statistics ***pls help!
for each of the following, assume the 2 samples are selected from populations with equal means and calculate how much difference should be expected, on average, between the 2 sample means. a)each sample has n = 5 scores with s^2 = 38 for the first sample, and s^2 =42 for the ...
April 14, 2011 by jerr ******

sosial studies
When 1.0 L solution Ba (NO3) 2 2.0 M at 25oC is mixed with 1.0 L solution of 2.0 M Na2SO4 in a calorimeter, the reaction that occurs to produce solid barium sulfate and temperature of the mixture increased to 28.1 oC. Calculate the enthalpy change per mole for the reaction ...
November 20, 2013 by Norsiah

Chemistry
a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, unreacted aluminum remains, and this unreacted aluminum ...
March 26, 2014 by Anonymous

Statistics
Are these statements true or false? 1. The sample mean, the sample proportion and the sample standard deviation are all unbiased estimators of the corresponding population parameters. 2. If the population is normally distributed with known variance then the sample mean may not...
November 5, 2010 by help

chemistry
If you mixed equal volume of .1 M HCl and .20 M Tris (pka=8.3), IS THE RESULTING SOLUTION A BUFFER SOLUTION? Why? or Why not?
September 18, 2010 by nicki

Chemistry pls help!!
A 32mL solution of 2.7M NaCL is mixed with 83mL of 1.8M HCL. What is the molaritt of the CL in the new solution. Thank you for your help
September 6, 2012 by Kate

analytical chemistry
a 0.4617g sample containing sodium bicarbonate was dissolved and titrated with standard 0.106M of hydrochloric acid solution , requiring 40.72ml. the reaction is: HCO3- + H+ -> H2O + CO2 Calculate the percent sodium bicarbonate in the sample. (Given molecular weight of ...
June 16, 2015 by zzz

Chemistry
A student actually used 0.847g sample of impure KHP and the endpoint was reached after 19.82 ml of sodium hydroxide solution was added, What is the percent KHP in the unknown to four significant figures.
July 31, 2011 by BEE

Chemistry
A student actually used 0.847g sample of impure KHP and the endpoint was reached after 19.82 ml of sodium hydroxide solution was added, What is the percent KHP in the unknown to four significant figures.
August 1, 2011 by BEE

Chemistry
If solution A had a pH of 8, and solution B had 1,000 times this hydrogen ion concentration what would be the pH of solution B, and would solution B be acidic or basic?
November 14, 2011 by Kristin

Chemistry
80.0 grams of KBr is mixed with sufficient water to prepare 1865 mL of solution. This solution is then mixed with 46.3 mL of 0.425 M KCl solution. 12 mL of this mixture is subsequently added to 61.0 mL of distilled water. Calculate the molarity of K+ ions in the final mixture...
March 1, 2011 by Christian

Chemistry
A 51.46 mL sample of an ammonia solution is analyzed by titration with HCl. The reaction is given below. NH3(aq) + H+(aq) NH4+(aq) It took 38.57 mL of 0.0984 M HCl to titrate (react completely with) the ammonia. What is the concentration of the original ammonia solution?
October 28, 2010 by Anonymous

math
One solution contains 20% acid and a second solution contains 50% acid. How many ounces of each solution should be mixed in order to have 60 ounces of a 30% acid solution?
January 27, 2014 by Anonymous

chemistry
How many mL of a 0.90% (m/v) NaCl stock solution will you need to to prepare 250 mL of a 0.225% m/v NaCl solution?
December 5, 2010 by nate

Chemistry UGH
Help please! I can't solve any of these, would someone be as kind as to show me the answers? How many moles of NaHCO3 are in a 125.0 g sample of the compound? 3. How many moles are in 6.73 x 1024 water molecules? 4-5. AgBr, a chemical used in photography can be made with this ...
May 28, 2009 by Daniel

Chemistry
A solution is prepared by mixing 45.00 mL of 0.022 M AgNO3 with 13.00 mL of 0.0014 M Na2CO3. Assume volumes are additive. Calculate [Ag+], [CO32-], [Na+] and [NO3-] after equilibrium is established.
November 15, 2013 by Olivia

chem 101
A 0.6753 g sample of an unknown metal was converted to the nitrate, MCl2, then a solution of the nitrate was treated with silver nitrate to give MCl2 (aq) + 2 AgNO3 → M(NO3)2 + 2 AgCl(s) silver chloride crystals. The silver chloride was isolated and weighed 1.7220 g. ...
March 17, 2012 by harley

chemistry
a radioactive material is undergoing nuclear decay. After 40 minutes, 25% of the sample remains. What is the half-life of the sample
August 27, 2011 by marjani

chemistry
100.0 mL of a dilute NaCl(aq) solution is heated in an open beaker. After 15 minutes the burner is turned off. Which of the following is true of the resulting solution? a more concentrated than the initial solution b less saturated than the initial solution c less concentrated...
December 7, 2014 by jepow

word problem
The half life of cesium-137 is 30 years. Suppose we have a 10-g sample. a)Find a function that models the mass remaining after t years. b)How much of the sample will remain after 80 years? c)After how long will only 2 g of the sample remain? Thanks (a) M(t) = mass of Cesium-...
February 14, 2007 by Jen

math
How many gallons of 5% acid solution should be mixed with 20 galllons of a 10% acid solution to obtain an 8% acid solution
June 13, 2012 by Andrea B

math
How many liters of a 2.5% bleach solution must be mixed with a 10% bleach solution to produce 600 ml of a 5% bleach solution?
September 8, 2014 by Ali

Chemistry
The determination of 4.000 mmol of ZnCl2 is performed gravimetrically by the addition of NaCN solution in a Total volume of 200.00ml. Ksp = 3.0X10^-16 for Zn(CN)2. State and verify all assumption. Assume cyanide does not hydrolyze. a. Derive the COC and COM equations for the ...
December 22, 2012 by WILL

Chemistry
The following two solutions were combined and mixed well: 150.00 mL of a 3.500 M iron() nitrate solution and 760.00mL of a 1.600M magnesium nitrate solution. 20.00mL of the final solution was transferred with a pipette into an empty 250.00mL volumetric flask. It was made up...
April 29, 2014 by Mantsha

Chemstry
The following two solutions were combined and mixed well: 150.00 mL of a 3.500 M iron() nitrate solution and 760.00mL of a 1.600M magnesium nitrate solution. 20.00mL of the final solution was transferred with a pipette into an empty 250.00mL volumetric flask. It was made up...
April 29, 2014 by Anonymous

Chemistry
To 40cm^3 of 1mol AgNO3 is added 20cm^3 of 0.500 AlCl3. What is the molar concentration of the resulting AgNO3 solution. The reaction, if needed, is 3AgNO3 + AlCl3 ==> 3AgCl + Al(NO3)3 I worked out the number of moles present in AgNO3 which is 0.04 mol, and the number of ...
December 30, 2012 by Matt

physics
A sample of lead has a mass of 69.00 kg and a density of 1.130 104 kg/m3 at 0C. (Assume the average linear expansion coefficient for lead is 2.900 10-5(C−1).) (a) What is the density of lead at 80.00C? (Give your answer to four significant figures.) (b) What is the ...
December 13, 2014 by Meagan

chemistry
When a 3.90-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperature drops from 24.5C to 19.3C. Calculate DH (in kJ/mol NH4NO3) for the solution process NH4NO3(s) ---> NH4+(aq) + NO3-(aq) Assume that the specific heat of...
July 4, 2012 by Kevin

CHEMistry
A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant pressure of one bar. Using ...
March 27, 2013 by HELP

chemistry
A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/C. The observed increase in temperature is 21.1 C at a constant pressure of one atm. ...
October 27, 2013 by brianna

Chemistry
When 100 mL of Ba(NO3)2 solution at 25 degrees Celsius is mixed with 100 mL solution CaSO4 solution at 25 degrees Celsius in calorimeter, the white solid BaSO4 forms and the temperature of the mixture increases to 28.1 degrees Celsius. Assuming that the calorimeter absorbs ...
December 9, 2012 by Megan

Please help with Chemistry?????
5.00 mL of 2.00x10^-3M Fe(NO3)3 is mixed with 4.03 mL of 2.00x10^-3M NaSCN and 1.08 mL of 0.1M HNO3, for a total volume of 10.11 mL. a) What is the initial concentration of the Fe(NO3)3 in the mixed solution? b) What is the initial concentration of the NaSCN in the mixed ...
February 26, 2014 by Dan

Chemistry
Chloroform is a liquid that is not soluble in water. It has a density of 1.498g/mL. Astudent mixed a sample of chloroform and a sample water and observed the result. Sketch what the student saw, and identify all components of the drawing. for a container, draw a test tube.
September 19, 2011 by jess

Chemistry
A 11.0-mL sample of an unknown H3PO4 solution requires 116mL of 0.140 KOH to completely react with the H3PO4. What was the concentration of the unknown H3PO4 solution (answer in M). H3PO4(aq) + 3KOH(aq) --> 3H2O(l) + K3PO4(aq)
July 23, 2014 by April

Molarity
A 44.8−mL sample of a 7.0M KNO3 solution is diluted to 1.10L What volume of the diluted solution contains 16.0g of KNO3? Would I do the same thing for this one or would does it have an extra step it it.
April 19, 2015 by Chemistry

Chemistry
Pb(NO3)2(aq) 2 x 10-3 M and Na2SO4(aq) 2 x 10-3 M Identify the ions that are present in each solution, and calculate their concentrations. If 1 L of each solution are mixed, will a precipitate be formed? Why?
May 16, 2012 by Sam

chemistry
Sodium thiosulfate, Na2S2O3, is used as a fixer in photographic film developing. The amount of Na2S2O3 in a solution can be determined by a titration with iodine, I2, according to the equation: 2Na2S2O3(aq) + I2(aq) --> Na2S4O6 +2NaI(aq). Calculate the concentration of the ...
March 2, 2014 by Muhammad

Chemistry
A .2688-g sample of a monoprotic acid neutralizes 16.4 mL of .08133 M kOH solution, calculate the molar mass of the solution? First of all how can I calculate the molar mass?
March 5, 2015 by Bob

Calculus
The amount of carbon-14 still present in a sample after t years is given by the function where C0 is the initial amount. Estimate the age of a sample of wood discovered by an archeologist if the carbon level in the sample is only 18% of its original carbon-14 level.
March 26, 2014 by Kimberly

Chemistry
(a) A 102-g sample of water is placed in an insulated container and allowed to come to room temperature at 21C. To heat the water sample to 41C, how much heat must you add to it? kJ (b) Consider the hypothetical reaction, being run in an insulated container that contains 102...
June 7, 2011 by Lance

Chemistry
A 25.00-mL sample of an H2SO4 (2 and 4 are subscripted) solution of unknown concentration is titrated with a .1328 M KOH solution. A volume of 38.33 mL of KOH was required to reach the endpoint. What is the concentration of the unknown H2SO4 (again, the 2 and 4 are subscripted...
January 4, 2010 by coug

Chemistry
A 25.00-mL sample of an H2SO4 (2 and 4 are subscripted) solution of unknown concentration is titrated with a .1328 M KOH solution. A volume of 38.33 mL of KOH was required to reach the endpoint. What is the concentration of the unknown H2SO4 (again, the 2 and 4 are subscripted...
January 4, 2010 by coug

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
May 12, 2010 by alex

chemistry
A sample of 7.83 grams of NaOH is dissolved into 620 mL of aqueous 0.250 M NaOH (as- sume no volume change). This solution is then poured into 1.67 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution?
September 6, 2010 by Anonymous

Chemistry
A buret is partially filled with NaOH solution, to a volume of 1.14mL. A 20-mL sample of 0.1011 M HCl is titrated to a faint pink phenolphthalein endpoint. The final buret buret reading is 22.37mL. What is the molarity of the NaOH solution? Please help. Thank you in advance.
March 27, 2015 by Michelle

chemistry 105
to what volume should you dilute 20 mL of a 10 M H2SO4 solution to obtain a 0.130 M H2SO4 solution?
October 10, 2011 by julie

chemistry 105
to what volume should you dilute 20 mL of a 10 M H2SO4 solution to obtain a 0.130 M H2SO4 solution?
October 10, 2011 by julie

SCIENCE
ALuminum can be determined gravimetricaly by the reaction with solution of 8-hydroxyquinoline (C9H7NO3).The net ionic equation . A mass of 0.1248g of Al(C9H6NO)3 WAS obtained by precipitating all of the the Al3+ from a solution prepared by dissolving 1.8571g of a mineral. what...
January 15, 2015 by NELLY

chemistry
a contaminated water sample has a H of 3. How many times more acidic is this sample compared to neutral water of 7
August 11, 2010 by Kelsey

statistics
from a normally distributed infinite number of iron bars lengths with a mean and standard deviation as 4 ft. and 0.6 ft. respectively, a sample of 100 bars is taken. if the sample mean is 4.2 ft., can the sample be called a truely random sample?
April 22, 2013 by aman

statistics
A simple random sample of a size n is drawn from a population that is normally distributed. The sample mean, x is found to be 110, and the sample standard deviation, s, is found to be 10. A- Construct a 95% confidence interval about u if the sample size, n, is 17
March 29, 2015 by Anonymous

Chemistry-iodometric titration
In an iodometric titration, excess potassium iodide solution (KI) is added to the sample.Analyte such as chlorine liberates iodine from KI under acidic condition. Liberated iodine is titrated against standard sodium thiosulphate. The concentration of analyte in the sample is ...
August 4, 2010 by angela

Chemistry
Please let me know how I'm doing with the following chemistry problems. I appreciate your imput. Here's problem 1: A sample of Helium gas occupies a volume of 29.4mL AT 18deg.celcius. (a)Would the volume of this gas sample be doubled at 36deg.celcius? (b)At what temperature(...
November 24, 2010 by Cliff

Statistics
For a population with a mean of (mew) = 50 and a standard deviation of 10, how much error, on average, would you expect between the sample mean (M) and the poulation mean for: a) a sample of n=4 scores b) a sample of n=16 scores c) a sample of n=25 scores Are the sample mean (...
May 24, 2011 by Aestas

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