What is the $pH$ of a $10^{-4} \ M \ OH^{-}$ solution at $330 \ K$,if $K_w$ at $330 \ K$ is $10^{-13.6}$?

If the $pH$ of a solution of an alkali metal hydroxide is $13.6$,the concentration of hydroxide is

Weight of $Ca(OH)_2$ needed to prepare $250 \ mL$ of solution with $pH = 13$. (in $g$)

What is the $pH$ of a $10^{-8} \ M$ solution of $HCl$?

Equal volumes of two solutions $A$ and $B$ of a strong acid having $pH=6.0$ and $pH=4.0$ respectively are mixed together to form a new solution. The $pH$ of the new solution will be in the range

The ratio of $pH$ of $0.1 \, M \, H_2SO_4$ and that of $0.1 \, N \, H_2SO_4$ is