Tuesday
July 22, 2014

Search: a solution is prepared by adding 50 ml of .050 M HCl to 150ml of .10M HNO3 calculate the concentrations of all species in this solution

Number of results: 19,279

chemistry
For reactions in solution, molar concentrations are usually used in equilibrium constant expressions (designated by K or Kc). In gases, partial pressures can also be used (designated by Kp). Equilibrium partial pressures of NOCl, NO and Cl2 in a container at 300 K are 1.2 atm...
April 10, 2013 by alex

Chemistry
Calculate molarity of HNO3 please help? Calculate molarity of HNO3 prepared by dissolving 22.3 grams of HNO3 in water to make 875 ml of solution... Please help I'm stuck
May 8, 2014 by Alex

Chemistry-please help
What is the purpose of adding zinc chloride in the preparation of starch iodide paste? Please refer to the procedure below: - Starch Iodide Paste- Heat 100mL of water in a 250mL beaker to boiling, add a solution of 0.75g of potassium iodide in 5mL of water, then add 2g of zinc...
March 8, 2011 by Jan

chemistry
Q.1 What will be the pH at the equivalence point during the titration of a 100 ml 0.2M solution of CH3COONa with 0.2M of solution of HCl?(Ka = 2*10^-5) Q.2 Aniline behaves as a weak base.When 0.1M,50ml solution of aniline was mixed with 0.1M,25ml solution of HCl the pH of ...
March 27, 2010 by gaurav

Chemistry
How many grams will dissolve on 3.0*10^2mL of 0.050 M Ca(NO3)2? Ksp=8.7*10^-9
March 21, 2011 by Dom

chemistry
1)A solution has a [OH-] of 5.2 x 10-4. What is the [H3O+] in the solution? 2) A 0.25 M solution of a monoprotic acid, HA, has a pH of 2.54. What is Ka for this acid? The dissociation of HA is: HA + H2O <--> H3O+ + A- (Hint: write the expression for pH) 3 A solution has...
December 9, 2012 by nicki

Chemistry
A solution container was only label 0.005M. When phenolphthalene was added onto the solution, the color of the solution turned pink. After identifying the type of solution,it was later titrated with sodium carbonate. If the solution was sulphuric acid,determine the (a) [H...
June 26, 2013 by Shane

College Chemistry 104
Students are attempting to construct a battery in the laboratory that will light up a light bulb. Compare the following lists prepared by students and determine which student will not be able to successfully build a "battery" that will light up the bulb. Student 1 large beaker...
May 10, 2013 by Claire

accounting
Fill in the blanks in the following separate income statements a through e. Identify any negative amount by putting it in parentheses. a b c d e Sales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $60,000 $42,500 $36,000 $ ? $23,600 Cost of goods sold ...
July 9, 2011 by Joann

grammer
I have learning how prepare for an effective meeting. For an effective meeting you must invite a neutral facilter to sensitive meeting, only hold a meeting if necessary , an meeting must have clear objectives , all meeting have an agenda which includes: topic for discussion...
December 20, 2011 by hiop

grammar
I have learning how prepare for an effective meeting. For an effective meeting you must invite a neutral facilter to sensitive meeting, only hold a meeting if necessary , an meeting must have clear objectives , all meeting have an agenda which includes: topic for discussion...
December 20, 2011 by hiop

Algebra (Verbal Expressions- More Difficult)
The sum of 6.5 times u, 5 and -2. plus the product of 3.5 and x is equal to the result of adding x, 4.5 times y and -10. The sum of x and y plus the result of adding z and 8.5 equals 2 times x plus -3 times y plus the result of multiplying 5 by u plus -7.. The result of adding...
November 23, 2013 by Joy

college chemistry
a student determined the Ca^2+ ion content of a 100mL sample of calcium-fortified orange juice. After adding 2.0M HCl solution to the sample, the student filtered the juice to remove the pulp and other particulate matter. Then the tudent added Na2CO3 solution to precipitate ...
October 8, 2012 by anne

Chemistry
500 ml of a buffer solution with ph=2.10 must be prepared using .4 M HNO2 and solid KNO2. The ka value of HNO2 is 4e-3. a.) What mass of KNO2 should be added to 3 L of the HNO2 to make the buffer? b.) What is the buffer's pH after 150 ml of .5 M HNO3 is added?
March 20, 2014 by Anonymous

chemistry
I have many questions. I have a test tuesday and need to get these problems done and understand them today because i am currently studying. I am in college and my professor has not emailed me back regarding solutions for the review problems she posted. Is it possible if you ...
April 23, 2011 by Sarah (C)

math place value numberation
write expanded notation.40,050=----
March 23, 2009 by queeneka

chemistry
Calculate the pH for each of the following solutions: (a) 0.10 M NH3 (b) 0.050 M C5H5N (pyridine)
July 6, 2010 by G

Chemistry
The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.530. If a trial's absorbance is measured to be 0.150 and its initial concentration of SCN was 0.00070 M, the equilibrium concentration of SCN...
April 10, 2008 by Anonymous

chem
The molarity and the molality of a solution prepared by dissolving 2.00 g of ethanol C2H5OH with 100.0 g of water to give a final volume 102 mL are would i just add both the grams and divide by 102 for molarity? and molalty i would just add the mass?
August 8, 2008 by so

Chemistry
Calcium can also be precipitated out of the solution by adding sodium phosphate (Na3PO4) to form solid calcium phosphate. A.) write a net ionic equation for this process B.)calculate the mass of this precipitate you would generate from treating 1.000 L of your unknown sample ...
March 25, 2014 by Mai

MATH
Solution A is 25% and solution B is 40% acid. How many gallons of each solution must be used in order to create a 50 gallon mixture that is 34% acid? Solution A___ Solution B___
October 12, 2011 by Diane

ALGEBRA
A chemist is asked to make 10 liters of a a35% solution. She has only a 10% solution and a 50% solution to work with. how much of each solution must she mix to ge 10 liters of the 35% solution?
January 28, 2012 by jackie

Chemistry
An aqueous KNO3 solution is made using 72.5 grams of KNO3 diluted to a total solution volume of 2.00 liters. If the molarity of the solution is .359 M and the molality of the solution is .354, what is the mass percent of the solution?
February 19, 2012 by Adam

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 ...
March 8, 2011 by Ben

chem
what is a liquid solution and a gaseous solution? Do you intend to ask us to name a liquid solution and a gaseous solution. One example of a liquid solution is vinegar. It is acetic acid in water. That is a solution of two liquids. An example of a gaseous solution is air. ...
May 14, 2007 by revie

Physics
What would be the result of removing or adding one proton from an atom of gold ? The atomic number of the element would change. It would not be gold anymore. Adding 1 proton increases the atomic number by 1, etc.. The isotope of the new element formed may be radioactive. (You ...
March 7, 2007 by WeatherGirl

chemistry
In sugar production, a process involves seeding of a supersaturated solution (sugar as solute) by adding 'ground sugar with few amounts of isopropyl alcohol'. My question is, why must the ground sugar be wetted with isopropyl alcohol? thanks in advance.
October 4, 2011 by Namie

chemistry -- help
In sugar production, a process involves seeding of a supersaturated solution (sugar as solute) by adding 'ground sugar with few amounts of isopropyl alcohol'. My question is, why must the ground sugar be wetted with isopropyl alcohol? thanks in advance.
October 4, 2011 by Namie

Chemistry
I am confused about why this is the answer to a practice problem I was given. (answer is c). Could someone explain why/why not for each answer? 2) Solution A is made from 1 L of water and 0.1 moles of Na(CH3COO), and Solution B is made from 1 L of water and 0.1 moles of Na2(...
March 7, 2010 by Trixie

science
a 13 ohm resister has 0.050 A of current in it. What is the potential difference across the resistor?
October 15, 2007 by j sapp

math 050
If there are 435 U.S. Representatives, how many votes are required for a simple majority (over 1/2)?
November 11, 2010 by Anonymous

Physics
) What is the minimum uncertainty in the velocity of an electron that is known to be somewhere between 0.050 nm and 0.10 nm from a proton?
February 5, 2014 by Jake

Physics
What is the minimum uncertainty in the velocity of an electron that is known to be somewhere between 0.050 nm and 0.10 nm from a proton
February 8, 2014 by Jake

chemistry
Take a cup of water, add sugar, and stir. If the resulting solution contains sugar crystals that do not dissolve, the solution is said to be? a)an unsaturated solution b)a saturated solution c)a homogeneous solution d)none of the above Is it d - supersaturated
July 23, 2010 by Thelma

Chemistry
What is the vapor pressure in Torr above a solution prepared by mixing 66.73g of benzene C6H6 with 63.26g toluene C6H5CH3 at 20 Celsius. The vapor pressure of pure benzene and toluene at 20celsius are 75 and 22 torr respectively. These compounds form nearly ideal solutions ...
April 23, 2011 by Jude

Chemistry
The freezing point of a cyclohexane sample is 6.20*C. A soltuion is prepared by dissolving 0.4660g of an unknown solute in 36.0g cyclohexane. The freezing point of the solution if 4.11*C. Calculate the molar mass of the unknown solute. Kf for cyclohexane is 20.0*Ckg/mole.
March 14, 2011 by K

chemistry
6.25 L of a propanoic acid-propanoate buffer must be prepared. The pH of the buffer needs to be 5.05. The solution will be 0.120M in propanoic acid. If the propanoate ion comes from the strontium propionate Sr(C3H5O2)2 then how many grams of strontium propanoate are needed?
March 1, 2013 by Studious

Chemistry
The freezing point of ethanol is -114.6 C and its Kf value is 2.00 C/m. What is the freezing point for the solution prepared by dissolving 50.0 g of glycerin (C3H8O3) in 200.0 g ethanol? I used Change in temp=Kfm kf=2.00 I calculated m to be 2.1736. I ended up the answer of -...
February 13, 2013 by Lauren

Chemistry - Please Help!
XeO3 + I- ----> Xe + I2 (acidic solution) CN)2 -----> CN- + OCN- (basic solution) MnO2 + SO32- ---> Mn2+ + S2O62- (acidic solution) H2SeO3 + H2S -----> S + Se (acidic solution) Cl2 ---> Cl- + ClO3- (basic solution) ClNO2 -----> NO3- + Cl- (acidic solution)
October 27, 2013 by Brittney

Chemistry
Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green solution 25.0mL 1.60M ...
October 29, 2012 by Jake

About Chemistry
The vapor pressure of pure water at 25 C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol) in 75 g of water. im not sure about the steps for problems like ...
September 15, 2010 by BEN

Chemistry
Determine the identity of an unknown solution that formed a yellow precipitate with solution 1, No Reaction with solution 2, No Reaction with solution 3, and a canary yellow solution with solution 4?
May 1, 2012 by Tiffany

Chemistry
In a lab that I am doing I am having difficulty in determining this: What are two indications that suggest a reaction has taken place when HCI was added to Mg? In this lab I am taking 0.1 Mg and adding it to the flask, then recording the temperature of the Mg which is (21 C). ...
February 14, 2009 by Anonomyous

grammar
Seeing pulsation of the artery at the completion of this dissection. which of the following is right for the above sentence. 1.This is a run-on that can be fixed with a period. 2. This is a run-on that can be fixed by adding a comma and a conjunction. 3. This is a fragment ...
June 15, 2011 by Troy LaBruce

Chemistry
At 20 degrees C ethanol has a density of 0.789 g/ml and H2O has a density of 1.0 g/ml. What is the % by volume of ethanol of a solution made by adding 50g of ethanol with 50g of H2O?
November 28, 2011 by Shelly

chemistry
this is a really long question. i don't understand how to answer it. help please. A 10.0% aquueous solution of sulfuric acid has a density of 1.0661 g/mL at 20 degrees celsius. A. how many grams of H2SO4 are found in 50.0 g of this solution? B. how many grams of water are ...
April 7, 2013 by Nicole

molal
the freezing point of ethanol (C2H5OH) is -114.6C. the molal freezing point depression constant for ethanol is 2.00C/m. what is the freezing point (C) of a solution prepared by dissolving 50.0 g of glycerin (C3H8O3, A nonelectrolyte) in 200 g of ethanol. any help would be ...
September 13, 2010 by lisa

molal
the freezing point of ethanol (C2H5OH) is -114.6C. the molal freezing point depression constant for ethanol is 2.00C/m. what is the freezing point (C) of a solution prepared by dissolving 50.0 g of glycerin (C3H8O3, A nonelectrolyte) in 200 g of ethanol. any help would be ...
September 13, 2010 by lisa

molal
the freezing point of ethanol (C2H5OH) is -114.6C. the molal freezing point depression constant for ethanol is 2.00C/m. what is the freezing point (C) of a solution prepared by dissolving 50.0 g of glycerin (C3H8O3, A nonelectrolyte) in 200 g of ethanol. any help would be ...
September 14, 2010 by lisa

grammar
Hey!Pls help me i am stuck with the sentence below. Seeing pulsation of the artery at the completion of this dissection. 1.This is a run-on that can be fixed with a period. 2.This is a run-on that can be fixed by adding a comma and a conjunction. 3.This is a fragment that can ...
June 15, 2011 by Troy LaBruce

CHEMISTRY
We have this following gas equilibrium : H2 + Cl2 <==> 2HCl + 184 kJ then predict the following to know Le chatlier's prediction 1) adding Cl2 2) removing HCl 3) elevation of pressure 4) lowering of the temperature 5) removing H2 and lowering pressure 6) adding catalyst ...
July 7, 2014 by MAD

statistics
Prepare a 700- to 1,050-word paper in which you interpret the statistical significance of a study.
August 31, 2010 by Anonymous

Chemistry
OOPs i Meant How many grams CaCo3will dissolve on 3.0*10^2mL of 0.050 M Ca(NO3)2? Ksp=8.7*10^-9
March 21, 2011 by Dom

Chemistry
How would you prepare 2.5 L of a 0.05 M solution of iron (III) chloride using iron (III) chloride hexahydrate Since 1 mol iron(III)chloride hexahydrate contains 1 mol iron(III) chloride, use the molar mass of the hexahydrate. M x L = grams/molar mass Solve for grams. In ...
May 2, 2007 by MEl

ap chemistry
for the following, mix the equal volumes of one solution from group I with one solution from group II to achieve the indicated pH. calculate the pH of each solution. Group I: .2M NH4Cl, .2M HCl, .2M C6H5NH3Cl, .2M (C2H5)3NHCl Group II: .2M KOI, .2M NaCN, .2M KOCl, .2M NaNO2 a...
February 9, 2012 by hannah

math
60 ml of solution A is mixed with 120 ml of solution B to produce solution C which contains 8% of pure acid. If 80ml of solution A is mixed with 40ml of solution B, a solution D containing 10% of pure acid can be produced. find the percentage of pure acid in solution A?
July 5, 2011 by anjan

Chemistry Acid/bases
The concentration of H2SO4 in a solution is 3.20 10-6 M. Assume the acid dissociates completely in solution. What is the [H3O+] in the solution? What is the [OH-] in the solution? What is the pH of the solution? What is the pOH of the solution? OK SO I KNOW HOW TO DO THESE ...
February 10, 2009 by Spencer

chemistry - vapor pressure
the vapor pressure of pure water at 25C is 23.8 torr. determine the vapor pressure (torr) of water at 25 C above a solution prepared by dissolving 35g of urea (a nonvolatile, non-electrolyte, MW = 60.0G/MOL) IN 76G of water. answer:21 i just want to know the steps bc im ...
September 13, 2010 by billy

chemistry
What is the pH of a solution prepared by dissolving 8.40 g of aniline hydrochloride C6H5NH3Cl in 750 mL of 0.210 M aniline,C6H5NH2? i kno to use the ph = pka + log (base/acid). getting pka isnt the issue, but what do i put into the log (base/acid)? (0.210/????) thanks
April 7, 2010 by anonymous

chemistry
What is the pH of a solution prepared by dissolving 8.40 g of aniline hydrochloride C6H5NH3Cl in 750 mL of 0.210 M aniline,C6H5NH2? i kno to use the ph = pka + log (base/acid). getting pka isnt the issue, but what do i put into the log (base/acid)? (0.210/????)
April 8, 2010 by anonymous

Chemistry
Saccharin (C7H5NO3S) is sometimes dispensed in tablet form. Ten tablets with total mass of 0.5800 g were dissolved in water. They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride solution. The mass of BaSO4 ...
September 29, 2013 by Anonymous

Visual Basic 2008 Programming
Help! I'm not sure how to start or how calculate. This is the project. Using For Next Loops. - When $1000 is deposited at 5 percent simple interest, the amount grows by $50 each year. When money is invented at 5 percent compound interest, then the amount at the end of each ...
November 16, 2010 by Lee

Science
Three acids solutions have the following pH: Solution A: pH = 2 Solution B: pH = 5 Solution C: pH = 3 Which solution is made with the acid that has the smallest ionization constant?
June 30, 2011 by Megan

chemistry
how many moles of solute are contained in each solution? 250 mL of a 0.55 M NaNO3 solution? 145 mL of a 4.0 M HNO3 solution? 6.5 L of a 2.5 M HCl solution?
April 11, 2010 by cathy

chemistry
Topic: Iodometry 1. The importance of precipitating the Cu2+ ions using NH3 and redissolving it with acetic acid 2. What are other means of detecting endpoint in iodometry aside from adding starch indicator 1. A pH that is too low leads to excessive oxidation of iodide ion to ...
July 29, 2007 by smiley

Chemistry
A teacher prepares a saturated NaCli solution at 55 Degree C. What is the % by mass 9m/m0 of this solution? what is the concentration of this solution expressed in ppm? What is the molality of this solution? If the density of the solution is 1.07 g/ml, what is the % m/v of ...
March 21, 2007 by nancy

Chemistry Help Please!!!
1) Boric acid, H3 BO3, is a triprotic acid that dissociates in three reactions. The first dissociation step is: H3BO3 ⇌ H^+ + H2BO3^-, K(a1) = 7.3 x 10^-10; the second dissociation step is: H2BO3^- ⇌ H^+ + HBO3^-2, K(a2) = 1.8 x 10^-13; and the third dissociation ...
February 17, 2014 by Mello

Chemistry
A solution of ethanol has a concentration of 4.613 mol/L at 20C. The density of the solution is 0.9667 g m/L.. Calculate the molality of the solution..please show the solution..thanks a lot
July 5, 2014 by Syam

medicine
What is final concentration of a mixed solution combining 50ml of 20% solution, 150 ml of a 15% solution and 200 ml of a 35% solution?
July 20, 2010 by Lisa

Chemistry DrBob
This is what i posted up a while back... i got to a using 0.520= a (.202M) and got a= 2.57 but now i don't know where to go from there with the ICE The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance...
April 12, 2008 by Amy

Chemistry
You prepare a solution by dissolving 58.5g of LiCL in 250ml of solution. If the solution is further diluted by having a total volume of 750ml, what is the concentration of the final solution?
July 3, 2013 by Junny

AP chemistry! Please Help
Consider the reaction of peroxydisulfate ion (S2O82-) with iodide ion (I -) in aqueous solution. S2O82-(aq) + 3 I -(aq) 2 SO42-(aq) + I3-(aq) At a particular temperature, the rate of disappearance of S2O82- varies with reactant concentrations in the following manner. ...
January 5, 2012 by Kaanha

chemistry
A solution is prepared by dissolving 0.2222 (0.0002) g of KIO3 in 50.00 (0.05) mL. (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of significant figures. (ii) Find the molarity and its uncertainty with an appropriate number of ...
March 28, 2010 by Hobson

Algabra A(1)
a solution of 67% soution is mixed with a solution o f57% to make 30 liters of a 59% solution. How many of each solution is used?
January 3, 2012 by Hannah

math
What is the solution to x+5+x+1+x=3(x+2)+1 1)x=0 2)x=3 3)no solution 4) infinite I got #3 no solution x+5+x+1+x=3(x+2)+1 x+5+x+1+x=3x+6+1 3x+6=3x+7 -3x -3x 6=7 so no solution Is this correct? Thanks for checking over my work.
January 11, 2014 by B8

Science/Chem
1. You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL of solution B ...
September 28, 2008 by Kelsey

science/chem
You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL of solution B and ...
September 28, 2008 by Kelsey

science (chemistry)
I have to do this lab where I titrate Na2CO3 with HCl dilute solution but i had to add Methyl orange indicator to the solution and im not sure what the endpoint is supposed to be colored, is it supposed to be orange or pink?? im confused and just how orange is it supposed to ...
June 21, 2007 by christina

Chemistry
is this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c. adding a ...
December 6, 2010 by Jason

Chem
did I do this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c. adding a ...
December 7, 2010 by Jason

Steps in Chemistry
You notice that a lawn looks unhealthy and that, perhaps, the grass is dying. Undertake a scientific project to save the lawn. What is your initial hypothesis? Describe an experiment you can design to test it - include more than 1 step and variables. Hypothesis: Adding water ...
May 8, 2014 by Angela

chem
How do these things shift the direction of a chemical reaction?: -adding/removing reactants -adding/removing products -adding/removing energy This is how I think I understand it: -adding more reactants pushes it to the right -removing reactants pushes it to the left -adding ...
March 17, 2007 by Mira

chemistry
Calculate the pH from the addition of 10 mL of a 0.10 M NaOH solution to 90 mL of 0.10 M HCl. okay so i understand how to do most of it but i get messed up at one part.. so i made my equation: NaOH + HCl -> H2O + NaCl (strong base, strong acid= complete dissociation) so net...
November 8, 2011 by BOB PLEASE HELP!:)

mastering chemistry
A solution of volume 80.0 mL contains 16.0 mmol HCHO2 and 9.00 mmol NaCHO2. If 1.00 ml of 12 M HCl is added to this, what will be the resulting pH? (the only problem im having for this question is how to approach it, i know that by adding HCl the concentration of the CB would ...
February 28, 2009 by chma11 student

College Chemistry
a solution contains .25M Ni(NO3)2 and .25 M Cu(NO3)2. Can the metal ions be separated by slowly adding Na2CO3?Assume that for successful separation 99% of the metal ion must be precipitated before the other metal ion begins to precipitate, and assume no vlume change on ...
March 12, 2010 by Jim

math
compare these decimals by choosing greater then, less then, or equal to. 0.205 and 0.21 0.04 and 0.050 0.41 and 0.405 0.1 and 0.1000 Thank you, BAILEY
October 20, 2009 by BAILEY

Chemistry
Consider the equation A(aq) + 2B(aq) 3C(aq) + 2D(aq). In one experiment, 45.0 mL of 0.050 M A is mixed with 25.0 mL 0.100 M B. At equilibrium the concentration of C is 0.0410 M. Calculate K.
February 16, 2014 by Sana

Science-Chemistry
In the following test for Sulfated Ash, ammonium carbonate solution was added. What is the purpose of adding ammonium carbonate solution? Heat a silica crucible to redness for 30 minutes, allow to cool in a desiccator and weigh. Place 1g of the substance in the crucible and ...
March 18, 2012 by anne

chemistry
I don't know how to explain or if Ive got my homework answer correct. The question is: A patient on dialysis has a high level of urea, a high level of sodium and a low level of potassium in the blood. Why is the dialyzing solution prepared with a high level of potassium but no...
April 14, 2011 by Connie

chem
A solution prepared by dissolving 3.00 grams of ascorbic acid (vitamin C, C6H8O6), in 50.0 grams of acetic acid has a freezing point that is depressed by T = 1.33 oC below that of pure acetic acid. What is the value of the molar freezing point-depression constant for acetic ...
February 18, 2013 by Ace

Chemistry DrBob
You told me the steps on a previous post but i must have forgot how to work out absorbance or ICE cus i keep getting the wrong answer ... The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.520...
April 10, 2008 by Amy

AP chem
A 0.345g sample of anhydrous BeC2O4, which contains an inert impurity, was dissolved in a sufficient water to produce 100ml of solution. A 20.0ml portion of the solution was titrated w/ KMnO4(aq). The balanced equation for the reaction that occurred is as follows: 16H^+(aq) + ...
January 4, 2007 by michelle

college algebra (maths 112)
To conduct a new experiment, a scientist needs a 23% salt water solution. How much of a 13% solution must be mixed with 45 quarts of a 32% solution to get the proper solution?
February 24, 2011 by Anonymous

Chemistry
The specific heat of a solution is X J/g*degreesC and its density is Y g/mL. The solution was formed by combining Z mL of solution A with Z mL of solution B, with each solution initially at J degreesC. The final temperature of the combined solutions is D. The heat capacity of ...
April 2, 2010 by Fred

math
A pharmacist wishes to mix a solution that is 6% Minocidil. She has on hand 60 ml of a 3% solution and wishes to add some 8% solution to obtain the desired 6% solution. How much 8% solution should she add?
January 17, 2012 by Hali

Chemistry
The vapor pressure of water at 25C is 23.76 mm Hg. What would you calculate as the new vapor pressure of a solution made by adding 50.5 g of ethylene glycol (HOCH2CH2OH, antifreeze) to 50.5 g of water? You may assume that the vapor pressure of ethylene glycol at this ...
January 26, 2011 by Rukky

ap chemistry
Sulfuric acid (H2SO4) is prepared commer- cially from elemental sulfur using the contact process. In a typical sequence of reactions, the sulfur is first burned: S + O2 ! SO2 , then it is converted to SO3 using a catalyst: 2 SO2 + O2 ! 2 SO3 . The resulting SO3 is reacted with...
September 11, 2012 by cheri

ap chemistry
Sulfuric acid (H2SO4) is prepared commer- cially from elemental sulfur using the contact process. In a typical sequence of reactions, the sulfur is first burned: S + O2 ! SO2 , then it is converted to SO3 using a catalyst: 2 SO2 + O2 ! 2 SO3 . The resulting SO3 is reacted with...
September 11, 2012 by cheri

Chemistry
1. Calculate the mass of each compound required to make 25mL of the following solutions: (a) 0.10 M Ni(NO3)2 6H2O (b) 1.0 M NaClO4 H2O (c) 0.11 M trien (C6H18N4) 2. Calculate the concentrations of Ni2+ and trien in a solution prepared by mixing equal volumes of solutions 2...
March 18, 2014 by Mia

Chem
Determine the concentrations of K2SO4, K , and SO42 in a solution prepared by dissolving 2.84 104 g K2SO4 in 2.25 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million (ppm). Note: ...
February 19, 2013 by Jhanvi

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