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In the eqantitative analysis Bi^(3+) is ...

In the eqantitative analysis `Bi^(3+)` is detected precipitation of `[BiO (OH)(s)]` [bismuthy`1` hydroxide). Calculate the `pH` when the following equilibria exists:
`BiO (OH)(s) hArr BiO^(o+)(aq) + overset(Theta)OH (aq) (K = 4 xx 10^(-10))`

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