The $pH$ of $0.1 \ M \ NaOH$ is

What is the $pH$ of $1 \times 10^{-4} \ M \ H_2SO_4$ solution?

The $pH$ of $1 \ N$ $KOH$ solution is:

$75 \ mL$ of $0.2 \ M \ HCl$ is mixed with $25 \ mL$ of $1 \ M \ HCl$. To this solution, $300 \ mL$ of distilled water is added. What is the $pH$ of the resultant solution?

The $pH$ of a $H_2SO_4$ solution is $5.0$. If more $H_2SO_4$ is added to this solution,the $pH$ becomes $2.0$. The concentration of $H^{+}$ ions will become how many times the initial concentration?

Concentration of $H^{+}$ ions in $10^{-4} \ M \ HCl$ solution is