• question_answer Will the pH of water be same at 4°C and 25°C? Explain.

No, pH of water is not same at 4°C and 25°C. This is because with increase in temperature, dissociation of${{H}_{2}}O$ molecules increases. Hence, $[{{H}^{+}}]$ will increase, i.e., pH decreases. Thus, pH at 4°C will be more than at 25°C.