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An aqueous solution of metal bromide MBr...

An aqueous solution of metal bromide `MBr_2 (0.05 M)` is saturated with `H_2 S`. For saturated `H_2 S` of `0.1 M, K_1 = 10^(-7)` and `K_2 = 1.3 xx 10^(-13)`. What is the minimum pH at which MS will precipitate? `K_(sp)`. for M S is `6 xx 10^(-21)`

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