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What pH must be maintained in a solution...

What pH must be maintained in a solution saturated in `H_2S` (0.1 M) and 10 M in `Zn^(2+)` to prevent ZnS from precipitating? `K_(sp) (ZnS)=1 xx 10^(-21), K_(a) (H_(2)S)=1.1 xx 10^(21)`.

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The correct Answer is:
`pH lt 2`
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What is maximum pH required to prevent the precipitation of ZnS in a solution that is 0.01 M ZnCl_(2) and saturated with 0.10M H_(2)S ? [Given : K_(sp)(ZnS)=10^(-21), K_(a_(1))xxK_(a_(2)) (of H_(2)S )= 10^(-20) ]

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