Homework Help: AP Chemistry

Posted by Olivia on Saturday, October 20, 2012 at 2:02pm.

Consider the following reaction.
CaSO4(s) Ca2+(aq) + SO42-(aq)
At 25°C the equilibrium constant is Kc = 2.4 10-5 for this reaction.
(a) If excess CaSO4(s) is mixed with water at 25°C to produce a saturated solution of CaSO4, what are the equilibrium concentrations of Ca2+ and SO42-?
(b) If the resulting solution has a volume of 5.5 L, what is the minimum mass of CaSO4(s) needed to achieve equilibrium?

AP Chemistry - DrBob222, Saturday, October 20, 2012 at 3:15pm
Claire, you and your alter ego, Olivia, need to learn how to make an arrow. ==> or --> or >>>.

.........CaSO4(s) ==> Ca^2+ + SO4^2-
I........sat'd........0.........0
C........sat'd........x.........x
E........sat'd.........x.........x

Kc = (Ca^2+)(SO4^2-) = 2.4E-5
Substitute from the ICE chart and solve for x = (Ca^2+) = (SO4^2-) in units of mols/L.

After you have part A probably you can do part B yourself but post your work here if you need additional help.
AP government and politics - Dick, Friday, May 10, 2013 at 2:11pm
WASSAP HOMESKILLETSi need help.. so does anyone know how much we need to know about equilibrium expressions for the AP gov and pol exam?? because my friend told me his exam last year asked him about chemical equilibrium on his exam and im afraid i might be asked this question and theni will not get a 5 on the exam and will not get into college and then wont have a job adn be begging on the streets and living in a hobo shelter...

Answer this Question

Related Questions

Chemsitry - At 25 °C, only 1.9 g CaSO4 (MM = 136 g/mol) will dissolve in 2....
Chemistry - Consider the reaction CaSO4(s)rightleftharpoons Ca^2+(aq)+ SO_4^2-(...
College Chemistry - Given the following equilibrium constants, Ka (NH4^+)=5.6*10...
chemistry - The value of pKb for the base ethylamine (CH3CH2NH2) is 3.19 at 25&...
AP chemistry! Please Help - Consider the reaction of peroxydisulfate ion (S2O82...
chemistry - Given the following information: Ni(OH)2(s) Ni2+(aq) + 2 OH (aq) Ksp...
chemistry - The correct interpretation of the equation below is: Fe3+(aq) + SCN...
chemistry... HELPP - Chemistry Equilibrium Constant PLEASE Help!? In an ...
chemistry - The correct interpretation of the equation below is: Fe3+(aq) + SCN...
chemistry - Consider the following reaction CaCl2(aq) + 2Ag2SO4(aq) ! CaSO4...

For Further Reading

First Name:
School Subject:
Answer: