Write the characteristics and uses of the $K_{a}$ value.

(N/A) The characteristics and uses of the $K_{a}$ value are as follows:
$(i)$ The larger the value of $K_{a}$,the stronger the acid.
$(ii)$ $K_{a}$ is a dimensionless quantity.
$(iii)$ The $[H^{+}]$ concentration of a weak acid and its $pH$ can be calculated using the value of $K_{a}$.
$(iv)$ The degree of ionization $\alpha$ can be calculated with the help of the $K_{a}$ value.
$(v)$ $pK_{a}$ is calculated using the value of $K_{a}$ as $pK_{a} = -\log(K_{a})$.
If the $pK_{a}$ value is higher,the acid becomes less strong.

$K_{a} = 1 \times 10^{-1}$	$K_{a} = 1 \times 10^{-2}$	$K_{a} = 1 \times 10^{-3}$
$pK_{a} = 1$	$pK_{a} = 2$	$pK_{a} = 3$