At what pH of the solution precipitation of NiS can be prevented by passing 0.1 M H₂S gas through a 0.1 M Ni²+ solution? Given:

Question

At what pH of the solution precipitation of NiS can be prevented by passing 0.1 M H₂S gas through a 0.1 M Ni²+ solution?
Given: Ksp of NiS = 10-17
H₂S 2H+ + S²; K= 10-21
pH = 1
pH = 2
pH = 3
pH = 4

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