The unit of the ionic product of water $K_w$ is:

Calculate the $[H_3O^+]$ concentration if the $pH$ of the solution is $4.25$.

If the $pH$ of a solution is $2$,find the $[H^{+}]$ of the solution.

The $pH$ of a solution having $[H^{+}] = 10 \times 10^{-4} \, \text{moles/litre}$ will be

$2$. Given below are two statements:
Statement $I$: The changes in $pH$ with temperature are so small that we often ignore them.
Statement $II$: When the hydrogen ion concentration changes by a factor of $100$,the $pH$ changes by one unit.
In the light of the above statements,identify the correct answer from the options given below:

At $298 \, K$,a solution has a $pOH$ of $13$. The solution is: ......