Assertion (A): `pK_(a)` of a weak acid become equal of the `pH` of the solution at the mid-point of titration.
Reason (R) : The molar concentration of the proton donor an proton acceptor beomes equal at the mid-point.

Options

A. If both (A) and (R) are correc, and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If (A) is incorrect, but (R) is correct.

Answer

B

Explanation

`(A)` is correct. At midpoint of rtitration of weak acid, `["salt"] = ["Acid"]` and therefore `pH = pK_(a)`
`(R)` is correct but not the reason of `(A)`.