At $25^{\circ} C$,the ${H_3}{O^+}$ concentration of a solution is $1.0 \times 10^{-10} \ M$. What is the $pOH$ value of the solution (in $.0$)?

For the following Assertion and Reason,the correct option is
Assertion : The $pH$ of water increases with increase in temperature.
Reason : The dissociation of water into $H^{+}$ and $OH^{-}$ is an exothermic reaction.

$pH$ of a solution is $5$. Its hydroxyl ion concentration is

At $25 \, ^\circ C$,the $pH$ value of a solution is $6$. The solution is:

The $pH$ of blood is .....

Derive the relation between $pH$ and $pOH$.