The concentration of $H^{+}$ ions in $0.1 \, M \, NaOH$ is .......

$pH$ values of $HCl$ and $NaOH$ solutions each of strength $\frac{N}{100}$ will be respectively:

Equal volumes of three acid solutions of $pH$ $3$,$4$ and $5$ are mixed in a vessel. What will be the $H^{+}$ ion concentration in the mixture in terms of $\times 10^{-4} \ M$?

The concentration in $M$ of $OH^{-}$ in $0.001 \ M$ $H_2SO_4$ is

At $25 \, ^\circ C$,the $OH^{-}$ ion concentration in $10^{-5} \, M \, HCl(aq.)$ is......

Which would decrease the $pH$ of $25 \ cm^3$ of a $0.01 \ M$ solution of hydrochloric acid?