The aqueous solution of $FeCl_3$ is acidic in nature. This is due to:

$pH$ of a salt solution of weak acid $(pK_a = 4)$ and weak base $(pK_b = 5)$ at $25^{\circ}C$ is:

If the $pK_a$ of acetic acid and $pK_b$ of dimethylamine are $4.76$ and $3.26$ respectively,the $pH$ of dimethylammonium acetate solution is

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

$A$ salt $X$ is dissolved in water $(pH = 7)$,and the resulting solution becomes alkaline in nature. The salt is made of:

The aqueous solution of ammonium chloride is