Calculate the $pOH$ of a solution at $25 \, ^\circ C$ that contains $1 \times 10^{-10} \, M$ of hydronium ions,i.e.,$H_3O^{+}$.

The $pH$ of water at $25\,^oC$ is nearly

At $298 \, K$,the equivalent conductivity of a $0.01 \, M$ solution of aniline hydrochloride is $122.5 \, \Omega^{-1} \, cm^2 \, eq^{-1}$,but in the presence of a sufficient excess of aniline to prevent hydrolysis,it is $106.5 \, \Omega^{-1} \, cm^2 \, eq^{-1}$. The equivalent conductivity of $HCl$ at infinite dilution is $426.0 \, \Omega^{-1} \, cm^2 \, eq^{-1}$. The hydrolysis constant of aniline is:

Calculate the concentration of $H^{+}$ ions in a solution if $pOH$ is $11$.

In an aqueous solution,the sum of $pH$ and $pOH$ is equal to ......

The concentration of hydrogen ion in a sample solution is $4.7 \times 10^{-4} \ M$. Find its $pH$.