At a certain temperature, the solubility of strontium arsenate, sr3(aso4)2, is 0.0650 g/l. what is the ksp of this salt at this temperature?
1 answer:
Answer is: Ksp for strontium arsenate is 2.69·10⁻¹⁸. Balanced chemical reaction (dissociation): Sr₃(AsO₄)₂(s) → 3Sr²⁺(aq) + AsO₄³⁻(aq). s(Sr₃(AsO₄)₂) = 0.0650 g/L. s(Sr₃(AsO₄)₂) = 0.0650 g/L ÷ 540.7 g/mol = 1.2·10⁻⁴ mol/L. s(Sr²⁺) = 3s(Sr₃(AsO₄)₂). s(AsO₄³⁻) = 2s(Sr₃(AsO₄)₂). Ksp = s(Sr²⁺)³ · s(AsO₄³⁻)². Ksp = (3s)³ · (2s)². Ksp = 108s⁵. Ksp = 108 · (1.2·10⁻⁴ mol/L)⁵ = 2.69·10⁻¹⁸.
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