At the equivalence point of a titration

CHEMISTRY · Single correct · AP · Chemistry · Acids and Bases · Acids and Bases

Problem

At the equivalence point of a titration, the solution contains

0.020\,\text{M}

of the conjugate acid

BH^+

. The parent base has

K_b = 1.6\times10^{-5}

. Assuming activity coefficients are unity, what is the pH of the solution at 25 °C? (a)

4.60

(b)

8.55

(c)

5.45

(d)

6.98