In a qualitative analysis, Bi^3+ is detected by appearance of precipitate of BiO(OH)(s). Calculate pH when the following equilibrium exists at 298 K:…

In a qualitative analysis, $\displaystyle \mathrm{Bi}^{3+}$ is detected by appearance of precipitate of $\displaystyle \mathrm{BiO}(\mathrm{OH})(\mathrm{s})$. Calculate pH when the following equilibrium exists at $\displaystyle 298$ K : $\displaystyle \mathrm{BiO}(\mathrm{OH})(\mathrm{s}) \rightleftharpoons \mathrm{BiO}^{+}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq})$, $\displaystyle K=4 \times 10^{-10}$ (Given : $\displaystyle \log 2=0.3010$ )