Question

For a pure water,

• A. pH increases and pOH decreases with increase in temperature
• B. pH decreases and pOH increases with increase in temperature
• C. both pH and pOH increase with increase in temperature
• D. both pH and pOH decrease with increase in temperature

Answer 1

The correct option is D

both pH and pOH decrease with increase in temperature

When the temperature is increased, it increases the kinetic energy of the molecules. This tends to increase the ionization and more water is converted to $H^{+}$ and ${OH}^{-}$ ions. Hence pH and pOH decreases on increasing the temperature