The Ksp of Mg(OH)₂ is 4.0 × 10⁻¹² mol³ dm⁻⁹. What is its molar solubility?
Correct answer B. 1.0 × 10⁻⁴ mol dm⁻³
Explanation
If solubility is s, then [Mg²⁺] = s and [OH⁻] = 2s, so Ksp = 4s³. Then s³ = 1.0 × 10⁻¹², giving s = 1.0 × 10⁻⁴ mol dm⁻³.
Answer checked How we write and check questions
Discussion