Further Applications of Ksp – Practice

Questions:

1) 0.50g of CaSO4was placed into 250 mL of water at 25°C and stirred. Determine whether a precipitate forms. The Ksp value for CaSO4 is 4.93 × 10-5

2) 0.250g of lead(II) chloride was placed into 100 mL of water at 25°C and stirred. Determine whether a precipitate forms. The Ksp value for lead(II) chloride is 1.70 × 10-5

3) Quantitatively compare the solubility of silver chloride in water and in 0.100 mol/L NaCl. Ksp for silver chloride is 1.77 × 10−10 at 25°C.

4) Determine the concentration of Mg2+ ions from Mg(OH)2 that will dissolve in a solution of 0.050 M NaOH. Ksp for Mg(OH)2 = 5.61 × 10−12 at 25°C:

Quick Answers:

1) Ksp = 2.16 × 10-6. No precipitate will form.

2) Ksp = 2.9 × 10-6. A precipitate will form.

3) Solubility of AgCl in water = 1.3 × 10-5. Solubility of AgCl in 0.1 mol/L NaCl = 1.77 × 10-9. 

4) 2.24 × 10-9 mol/L

Worked Answers: (coming soon)