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What is the minimum pH required to preve...

What is the minimum pH required to prevent the precipitation of `Zn^(+2)` in a solution that is 0.01 M `ZnCl_(2)` and saturated with 0.1 M `H_(2)` S (Given : `K_(sp)` ZnS = `10^(-21)` and `Ka_(1) xx Ka_(2) ` of `H_(2)S = 10^(-20)` )

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The correct Answer is:
1
`[Zn ^(+2) ] =0.01 M rArr K_(sp) = [Zn^(+2) ][S^(-2)]`
`10 ^(-21) = (10 ^(_2) ) [S^(-2) ]rArr [S^(-2) ]=10 ^(-19) M`
`H_2S hArr 2H^(+) +S^(-2) rArr K_(eq) =([H^(+)][S^(-2)])/( [H_2S]) `
` 10 ^(-20) =([H^(+) ]^(2) (10^(-19)))/( 10^(-1) ) rArr [H^(+) ]=0.1 M`
` pH =1`
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