Practice question
Question
In a saturated solution of a sparingly soluble salt MX₂ , the solubility is S mol/L. If Ksp = 4S³ , what is the relationship between M²⁺ and X⁻ ?
Explanation
For MX₂ <=> M²⁺ + 2X⁻ , [M²⁺] = S , [X⁻] = 2S , so Ksp = S (2S)² = 4S³ . Thus, [X⁻] = 2[M²⁺] .
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