The solubility of copper(II)arsenate, Cu₃(AsO₄)₂, in pure water is 3.7 × 10^-⁸ moles per liter. Calculate the value of K_sp for copper(II)arsenate from this data.

Question

Quizplus · Accepted Answer

The dissolution of Cu₃(AsO₄)₂ can be represented as: Cu₃(AsO₄)₂ ⇌ 3Cu²⁺ + 2AsO₄³⁻. If the solubility is 3.7 × 10⁻⁸ M, then [Cu²⁺] = 3 × 3.7 × 10⁻⁸ M and [AsO₄³⁻] = 2 × 3.7 × 10⁻⁸ M. Ksp = [Cu²⁺]³[AsO₄³⁻]² = (3 × 3.7 × 10⁻⁸)³(2 × 3.7 × 10⁻⁸)² = 7.5 × 10⁻³⁶.

The Solubility of Copper(II)arsenate, Cu3(AsO4)2, in Pure Water Is 3

The Solubility of Copper(II)arsenate, Cu₃(AsO₄)₂, in Pure Water Is 3