A 0.050 M H2S solution contains 0.10 M NiCl2 and 0.35 M Hg(NO3)2. What pH is...

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A 0.050 M H₂S solution contains 0.10 M NiCl₂ and 0.35 M Hg(NO₃)₂. What pH is required to precipitate the maximum amount of HgS but none of the NiS?

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