Acid/Base and Solid Equilibrium

Which of the following is a conjugate acid/base pair?

• HCl/OCl^-
• H₂SO₄/SO₄^2-
• NH₄⁺/NH₃
• H₃O⁺/OH^-

Silver chromate, Ag₂CrO₄, has a K_sp of 8.96 x 10^-12. Calculate the solubility in mol/L of silver chromate.

• 1.31 x 10^-4M
• 1.65 x 10^-4M
• 2.25 x 10^-12M
• 2.08 x 10^-4M

The pH of a solution at 25^ₒC in which [OH-] = 3.9 x 10^-5M is:

• 4.41
• 3.90
• 9.59
• 4.80

Calculate the pH of a 0.47M NH₃ (K_b = 1.8 x 10^-5) solution.

• 2.54
• 8.93
• 5.07
• 11.46

The solubility of CaSO₄ in pure water at 0^ₒC is 1.14 g/L. The value of the solubility product is

• 8.37 x 10^-3
• 1.14 x 10^-3
• 9.15 x 10^-2
• 7.01 x 10^-5

The solubility of Cd(OH)₂ in water is 1.67 x 10^-5 mol/L. The K_sp value for Cd(OH)₂ is

• 1.86 x 10^-14
• 4.66 x 10^-15
• 5.58 x 10^-10
• 1.67 x 10^-5

A weak acid, HF, is in solution with dissolved sodium fluoride, NaF. If HCl is added, which ion will react with the extra hydrogen ions from the HCl to keep the pH from changing?

• OH^-
• Na⁺
• F^-
• Na^-

The correct mathematical expression for finding the molar solubility (s) of Sn(OH)₂ is:

• 2s² = Ksp
• 2s³ = Ksp
• 4s³ = Ksp
• 8s³ = Ksp

An unknown salt, M₂Z, has a K_sp of 3.3 x 10^-9. Calculate the solubility in mol/L of M₂Z.

• 2.9 x 10^-5 M
• 5.7 x 10^-5 M
• 9.4 x 10^-5 M
• 3.7 x 10^-5 M

The molar solubility of PbI₂ is 1.52 x 10^-3 M. Calculate the value of K_sp for PbI₂.

• 3.51 x 10^-9
• 1.40 x 10^-8
• 4.62 x 10^-6
• 1.52 x 10^-3