Question

At $25^{{}^{\circ }}\text{C}$ the pH of water is 7. When temperature of water is increased to $70^{{}^{\circ }}\text{C}$ than pH of water and nature of water is

• A. pH will decrease and the sample becomes acidic
• B. pH will increase but the sample will remain neutral
• C. pH will remain constant as $7.$
• D. pH will decrease but the sample will remain neutral.

Answer 1

Answer: (D)

High temperature pH and pOH of water decreases so, it will be less then 7 but $\left[{\text{H}}^{+}\right]=\left[{\text{OH}}^{-}\right]$ so solution become neutral.