Which of the following statements is//are correct?

Options

A. The `pH` of `1.0 xx 10^(-8)M` solution of `HCI` is `8`.
B. The conjugate base of `H_(2)PO_(4)^(Theta)` is `HPO_(4)^(-2)`.
C. The autoprotolysis constant of water increases with temperature.
D. When a solution of a weak monoprotic acid is trated against a strong base, at half-neutralisation point, `pH = (1//2) pK_(a)`.

Answer

B, C

Explanation

a. The `pH` of `1.0 xx 10^(-8)M` solution of `HCI` is not `8`, it is less than. `7`.
b. `H_(2)PO_(4)^(Theta) hArr HPO_(4)^(2-) +H^(o+)`
c. Autoprotolysis constant of water or ionic product of water increases with increase in temperature.
d. When a solution fo a weak monoprotic acid is trated against a strong base, a half-neutralisation point `pH = pK_(a)`.