Practice question
Question
For Ag₂S(s) <=> 2Ag+(aq) + S²⁻(aq) , Ksp = 6.0 × 10⁻⁵⁰ . If [Ag+] = 1.0 × 10⁻¹⁵ M in a saturated solution, what is [S²⁻] ?
Explanation
Ksp = [Ag+]²[S²⁻] = 6.0 × 10⁻⁵⁰ . Given [Ag+] = 1.0 × 10⁻¹⁵ , (1.0 × 10⁻¹⁵)² [S²⁻] = 6.0 × 10⁻⁵⁰ , 1.0 × 10⁻³⁰ [S²⁻] = 6.0 × 10⁻⁵⁰ , [S²⁻] = 6.0 × 10⁻²⁰ M .
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