Hydrosulfuric acid H2S was used for years in chemistry laboratories to precipita

Question

Hydrosulfuric acid H2S was used for years in chemistry laboratories to precipitate metal sulfides from solution. The H2S dissociates in two steps to form the S^2 ion that then reacts with the metal ion in solution. By controlling the hydrogen ion concentration, the amount of sulfide in the solution can be controlled, and thus, very insolute metal sulfides may be precipitated while other metals remains in solution. Given that for H2Saq, Ka1=9.5X10^-8, A2=1.3X10^-14), Ksp for MnS=3.0X10^-11 and that a saturated solution of H2S is approximately 0.100M calculate the hydrogen ion concentration required to prevent the precipiration of MnS

Explanation / Answer

9.75 x 10 -5 molar hydrogen ion

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