The $pH$ of water at $25\,^oC$ is nearly

If the $pH$ of a soft drink is $3.7$,what is the concentration of hydrogen ions?

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

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

At $90\,^{\circ}C$ pure water has $[H_3O^{+}] = 10^{-6}\,M$. The value of $K_w$ at this temperature will be:

The $pH$ of a solution is $5.0$. To this solution,sufficient acid is added to decrease the $pH$ to $2.0$. The increase in hydrogen ion concentration is $...$ times.