SOLUBILITY EQUILIBRIUM PRACTICE PROBLEMS
Type A and B Ksp Calculations
1. Write the Ksp expression for these equilibria.
a. BaCrO4(s) Ba+2(aq) + CrO4-2(aq)
b. Ag3PO4(s) 3Ag+1(aq) + PO4-3(aq)
2. Write the Ksp expression for these compounds.
a. AgI
b. PbCrO4
c. Al(OH)3
d. ZnCO3
e. Zn(OH)2
3. One litre of water is able to dissolve 2.15*10-3 mol of lead (II) fluoride. What is the
Ksp for lead (II) fluoride?
4. What is the molar solubility of silver bromide in water?
5. What is the molar solubility of silver carbonate in water?
6. Magnesium hydroxide has a solubility of 0.00705 g/L at 25°C.
a. What is the solubility expressed in mol/L?
b. What are the magnesium and hydroxide ion concentrations in mol/L
c. Calculate Ksp for this salt
7. At 25°C, the molar solubility of silver phosphate is 1.8*10-5 mol?L. Calculate Ksp.
8. Gold (III) chloride has a Ksp = 3.2*10-25. Calculate its solubility in pure water.
9. Barium sulfate is so insoluble that it can be swallowed without significant danger,
even though the barium ion is toxic. At 25°C, 1 L of water dissolves only 0.00245 g
of barium sulfate.
a. How many moles of barium sulfate dissolve per litre?
b. What are the molar concentrations of the barium ion and sulfate ion in a saturated
solution?
c. Calculate its Ksp.
10. A student prepared a saturated solution of calcium chromate and found that when 100
mL of this solution was evaporated, 0.416 g of calcium chromate was left behind.
What is the value of Ksp for this salt?
11. Chalk is calcium carbonate and at 25°C, its Ksp = 4.5*10-9. What is the molar
solubility of calcium carbonate. How many grams of calcium carbonate will dissolve
in 100 mL of water?
