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Relation between Precipitation and pH Value

A 0.10 M Mn 2+ solution is saturated with H2S. At what pH will MnS begin to precipitate? [H2S] sat'd=0.10M

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We start with the solubility product expression for MnS.
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<br>Ksp = [Mn2+]* [S2-] = 3 * 10^-13
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<br>We then substitute what we know about the Mn2+ ion concentration into this equation and calculate the S2- ion concentration at which MnS just starts to precipitate.
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<br>[0.10]*[S2-] = 3 * ...

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