[Zn2+] = 4.32 x 10-13M
Explanation
[Mn2+] = 1.18 x 10-2 M
Ksp MnS = [Mn2+][S2-]
5.1 x 10-15 = (1.18 x 10-2 M) * [S2-]
[S2-] = (5.1 x 10-15) / (1.18 x 10-2 M)
[S2-] = 4.32 x 10-13 M
At this concentration of sulfide, manganese(II) ions begin to precipitate
Ksp ZnS = [Zn2+][S2-]
2.0 x 10-25 = [Zn2+] * (4.32 x 10-13 M)
[Zn2+] = (2.0 x 10-25) / (4.32 x 10-13 M)
[Zn2+] = 4.63 x 10-13 M
concentration of zinc ions is 4.32 x 10-13 M when manganese(II) ions begin to precipitate
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