For an acidic solution,the $[OH^{-}]$ will be .........

The $pH$ of $D_2O$ and $H_2O$ at $298 \ K$ is

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

What is the dissociation constant of water at $25^{\circ}C$?

Observe the following solutions:
$I$. Black coffee
$II$. $0.2 \ M \ NaOH$
$III$. Lemon juice
$IV$. Lime water
$V$. Human saliva
$VI$. Tomato juice
The number of solutions having $pH$ range of $1-7$ and $7-14$,in the above list,is respectively.

What is the $pH$ of a solution containing $2.2 \times 10^{-6} \ M$ hydrogen ions?