Question Detail
Question
Calculate the pH of 0.002 mol dm⁻³ solution of calcium hydroxide
Correct Answer
Option D is the correct answer.
Detailed Explanation
Ca(OH)₂ is a strong base that dissociates completely: Ca(OH)₂ → Ca²⁺ + 2OH⁻. [OH⁻] = 2 × 0.002 = 0.004 M. pOH = -log(0.004) = 2.40. pH = 14 - 2.40 = 11.60.
Hint
Remember Ca(OH)₂ produces 2 OH⁻ ions per formula unit.