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An aqueous solution of a metal bromode M...

An aqueous solution of a metal bromode `MBr_(2) (0.05M)` is saturated with `H_(2)S`. What is the minimum `pH` at which `MS` will precipitate? `K_(sp)` for `MS = 6.0 xx 10^(-21)`. Concentration of satured `H_(2)S = 0.1M, K_(1) = 10^(-7)` and `K_(2) = 1.3 xx 10^(-13)` for `H_(2)S`.

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