Solubility product and pH calculation

2026 1 question

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