Calculate the $pOH$ of a $0.001 \text{ M } HCl$ solution.

The $pH$ of $10^{-7} \ M \ NaOH$ is

At $298 \, K$,what is the concentration of hydrogen ions in a $10^{-8} \, M \, HCl$ aqueous solution? $(K_W = 10^{-14})$

Following solutions were prepared by mixing different volumes of $NaOH$ and $HCl$ of different concentrations:
$a. \; 60 \; mL \; \frac{M}{10} \; HCl + 40 \; mL \; \frac{M}{10} \; NaOH$
$b. \; 55 \; mL \; \frac{M}{10} \; HCl + 45 \; mL \; \frac{M}{10} \; NaOH$
$c. \; 75 \; mL \; \frac{M}{5} \; HCl + 25 \; mL \; \frac{M}{5} \; NaOH$
$d. \; 100 \; mL \; \frac{M}{10} \; HCl + 100 \; mL \; \frac{M}{10} \; NaOH$
$pH$ of which one of them will be equal to $1$?

Calculate the $pOH$ of a $0.01 \text{ M}$ monobasic acid solution that is completely dissociated at $298 \text{ K}$.

The $pH$ of a $10^{-10} \ M \ NaOH$ solution is nearest to