# Chem

posted by .

You made up a saturated solution of calcium sulfate (CaSO4). The temp is 25 degrees Celsius. You then add 5.00*10^-3 of sodium sulfate (NaSO4). What are the concentrations of calcium and sulfate after equilibrium is reached? The pKs of CaSO4 is 4.58.

I know the Ks of CaSO4 to be 10^(-4.58) which equals 2.63E-5 but then what?

• Chem -

CaSO4 ==> Ca^2+ + SO4^2-
Ksp = (Ca^2+)(SO4^2-) = 2.63E-5
From CaSO4 alone;
(Ca^2+) = x
(SO4^2-) = x

Na2SO4 ==> 2Na^+ + SO4^2-
You added 5.00E-3 WHAT? Is that molar? If so, then Na^2+ = 2*5.00E-3M
and (SO4^2-) = 0.005M
Plug all of this into Ksp for CaSO4.
Ksp = (x)(x+0.005) = 2.63E-5
Solve for x, then x + 0.005.

## Similar Questions

A 1.994 g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temp. above 170 C in a crucible until a constant mass is reached. The mass of anhydrous CaSO4 salt is 1.577 g. Calculate the percent by mass of water …
2. ### chemistry

A 1.994 g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temp. above 170 C in a crucible until a constant mass is reached. The mass of anhydrous CaSO4 is 1.577g. what is percent by mas of water in the hydrated …
3. ### Chemistry

Hi, I have a few chemistry problems that I'm having trouble solving. I put my attempted solutions after the problems in *'s. There was one problem I had no idea how to solve. What concentration of silver chromate (Ksp = 9.0 x 10-12) …
4. ### Chemistry (urgent)

Hi, I have a few chemistry problems that I'm having trouble solving. I put my attempted solutions after the problems in *'s. There was one problem I had no idea how to solve. What concentration of silver chromate (Ksp = 9.0 x 10-12) …

A saturated solution of CaSO4(aq) is made in a beaker until there is excess calcium sulfate resting at the bottom. Then solid potassium sulfate is added. Which of the following is true?
6. ### chemistry

you made up a standard solution of calcium sulfate (CaSO4). the temperature is 25C. you then add 5.00*10^-3 odium sulfate (Na2SO4). Calculate the concentrations of calcium and sulfate after equilibrium is reached?
7. ### 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?
8. ### chemistry

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0210 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate?
9. ### Chemistry

3.2 grams of calcium chloride reacts with 3.55 grams of sodium sulfate producing calcium sulfate + sodium chloride. Which is the reactant in excess and the excess mass?
10. ### chimistry

What is the solubility of calcium sulfate (CaSO4) in 0.30 M aqueous sodium sulfate (Na2SO4)?

More Similar Questions