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

question 99

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 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.

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