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Question

What is the maximum concentration of equimolar solutions of ferrous sulphateand sodium sulphide so that when mixed in equal volumes, there is no precipitation of iron sulphide? (For iron sulphide, Ksp=6.3×1018).

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Solution

Let x M be the concentration of both FeSO4 solution and Na2S solution.
When equal volumes of two solutions are mixed,
[FeSO4]=[Na2S]=[Fe2+]=[S2]=x2M
FeSFe2++S2
Ksp=[Fe2+][S2]
6.3×1018=x2×x2
x=5.02×109M
This is the maximum concentration of FeSO4 and Na2S which will not precipitate iron sulphide.

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