Question

The pKa of a weak acid, HA, is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be

• A. 4.79
• B. 7.01
• C. 9.22
• D. 9.58

Answer 1

Answer: (B)

7.01

Answer 2

pH = 7 + $\frac{1}{2}$pKa – $\frac{1}{2}$pKb = 7 + $\frac{4.8}{2}$ – $\frac{4.78}{2}$ = 7.01