At , the ion-product constant of water is . A solution of the weak base has . What is…

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

40\,^{\circ}\mathrm{C}

, the ion-product constant of water is

K_w = 2.92\times10^{-14}

. A

0.20\,\text{M}

solution of the weak base

\mathrm{BOH}

has

K_b = 2.2\times10^{-5}

. What is the pH of the solution at

40\,^{\circ}\mathrm{C}

? (a) 11.52 (b) 10.86 (c) 11.32 (d) 10.46