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What is the minimum pH required to preve...

What is the minimum pH required to prevent the precepitation of ZnS in a solution that is 0.01 M `ZnCl_(2)` and saturated with 0.10 M `H_(2)S`? [Given `k_(sp) " of " ZnS = 10^(-21), "For " H_(2)S K_(a1) xx K_(a2) = 10^(-20)]`

Text Solution

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The correct Answer is:
1
`K_(SP) =[Zn^(2+)][S^(2-)]`
`[S^(2)] =10^(-21)/0.01 = 10^(-19)`
`therefore` for `K_(a1).K_(a2) = ([H^(+)]^(2)[S^(2-)])/([H_(2)S])`
`10^(-20) = ([H^(-)]^(2) xx 10^(-19))/(0.1) rArr [H^(+)] = 0.1` or pH =1
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