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Precipitation question. A mixture contains 1.0 x 10^-3 M Cu2+ and 1.0 x 10^-3 Mn2+ and...

Precipitation question. A mixture contains 1.0 x 10^-3 M Cu2+ and 1.0 x 10^-3 Mn2+ and is saturated with 0.10 H2S. Determine a pH where CuS precipitates but MnS does not precipitate. Ksp for CuS is 8.5 x 10^-45, and Ksp for MnS is 2.3 x 10^-13. Ka1 of H2S is 8.9 x 10^-8 and Ka2 is 1 x 10^-19. Please show all your work.

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