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The salt ZN (OH)(2) is involved in the f...

The salt `ZN (OH)_(2)` is involved in the following two equilibria:
`Zn(OH)_(2)(s) hArr Zn^(3+)(aq) +2 overset(Theta)OH(aq) K_(sp) = 1.2 xx 10^(-17)`
`Zn(IH)_(2)(s)+2 overset(Theta)OH hArr Zn(OH)_(4)^(2-)(aq)K_(f) = 0.12`
Calculate `|overset(Theta)OH|` at which solubility of `Zn(OH)_(2)` be a minimum. Also find the solubility of `Zn(OH)_(2)` at this `pH`.

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