The $H^{+}$ ion concentration is $1.0 \times 10^{-6} \ mol/L$ in a solution. Its $pH$ value will be

The $pH$ of an acidic solution is $4.70$. Calculate the concentration of $OH^-$ ions. $(pK_w = 14)$

The unit of the ionic product of water $K_w$ is:

The $pH$ of water is $7$ at $25^{\circ} C$. If water is heated to $80^{\circ} C$,its $pH$ will:

At $90\,^oC$,pure water has $[H^{+}] = 10^{-6}\,M$. If $100\, mL$ of $0.2\, M\, HCl$ is added to $200\, mL$ of $0.1\, M\, KOH$ at $90\,^oC$,then the $pH$ of the resulting solution will be:

The concentration of hydrogen ion in pure water at $298 \ K$ is: