For pure water:

Options

A. Both `pH` and `pOH` decrease with increase in temperature.
B. Both `pH` and `pOH` increase with increase in temperature.
C. `pH` decreases and `pOH` increases with increase in temperature.
D. `pH` increase and `pOH`decreases with increase in temperature.

Answer

A

Explanation

With increase in temperature the ionisation of `H_(2)O` increases and hence the `[H^(o+)]` and `[overset(Theta)OH]` increases. Therefore, `pH` and `pOH` decreases with increase of temperature.