The $pK_{a}$ of a weak acid $HA$ is $4.80$ and the $pK_{b}$ of a weak base $BOH$ is $4.78$. What is the $pH$ of an aqueous solution of the salt $BA$?

Find the equilibrium constant for the equilibrium reaction:
$HCOO^{-} + H_2O \rightleftharpoons HCOOH + OH^{-}$
Given that the dissociation constant of formic acid is $K_a(HCOOH) = 1.8 \times 10^{-4}$.

Which of the following is not an acidic salt?

Which of the following salts has the minimum $pH$ in an aqueous solution?

The aqueous solution of $FeCl_3$ is acidic due to

The aqueous solution of which of the following salts has the lowest $pH$?