Equilibrium

Question

The p_Ka of a weak acid, H_A, is 4.80. The p_Kb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be

9.58

4.79

7.01

9.22

Answer

7.01

It is a salt of weak acid and weak base
$left square bracket straight H to the power of plus right square bracket space equals space square root of fraction numerator straight K subscript straight w space straight x space straight K subscript straight a over denominator straight K subscript straight b end fraction end root pH space equals space 7.01$