At $90\,^{\circ}C$,pure water has $H_3O^{+}$ ion concentration of $10^{-6}\,mol\,L^{-1}$. The $K_w$ at $90\,^{\circ}C$ is

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

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:

At $45 \, ^oC$,the $pK_w$ of a neutral solution is $13.36$. The $pH$ of the solution will be .....

The $H^{+}$ ion concentration is $1.0 \times 10^{-6} \ mol/L$ in a solution. Its $pH$ value will be

The $pH$ of a sample of vinegar is $3.76$. Calculate the concentration of hydrogen ion in it.