A Saturated Solution of Calcium Hydroxide, Ca(OH)₂, Is in Contact

Multiple Choice

A saturated solution of calcium hydroxide, Ca(OH) ₂, is in contact with excess solid Ca(OH) ₂. Which of the following statements correctly describes what will happen when aqueous HCl (a strong acid) is added to this mixture, and system returns to equilibrium? (For Ca(OH) ₂, K_sp = 6.5 × 10⁻⁶)

A) The solubility of Ca(OH) ₂ will be unchanged.
B) The OH ⁻ concentration will decrease and the Ca ²⁺ concentration will increase.
C) The OH ⁻ concentration will increase and the Ca ²⁺ concentration will decrease.
D) The concentrations of both Ca ²⁺ and OH ⁻ will increase.
E) The solubility of Ca(OH) ₂ will decrease.