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 Ca²⁺ concentration will increase. C) The OH^- concentration will increase and the Ca²⁺ concentration will decrease. D) The concentrations of both Ca²⁺ and OH^- will increase. E) The solubility of Ca(OH)₂ will decrease.

Question

Quizplus · Accepted Answer

When aqueous HCl is added to a saturated solution of Ca(OH)₂, the OH^- concentration will decrease and the Ca²⁺ concentration will increase. This is because the HCl will react with the OH^- ions to form water, which will shift the equilibrium to the left, causing more Ca(OH)₂ to dissolve.

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

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