Practice question

MCQ

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⁻ ?

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Choose one · Correct answer highlighted

[X⁻] = [M²⁺] [X⁻] = 2[M²⁺] Correct [M²⁺] = 2[X⁻] [X⁻] = 4[M²⁺]

Explanation

For MX₂ <=> M²⁺ + 2X⁻ , [M²⁺] = S , [X⁻] = 2S , so Ksp = S (2S)² = 4S³ . Thus, [X⁻] = 2[M²⁺] .

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