A weak acid is titrated with a weak base. Consider the following statmenets regarding the pH of the solution at the equivalence point :
(i) pH depends on the concentration of acid and base.
(ii) pH is independent of the concentration of acid and base.
(iii) pH depends on the `pK_a` of acid and `pK_b` of base.
(iv) pH is independent of the `pK_a` of acid and `pK_b` of base.
The correct statments are :

Options

A. only (i) and (iii)
B. only (i) and (iv)
C. only (ii) and (iii)
D. only (ii) and (iv)

Answer

C

Explanation

For salts of weak acid and weak base
` pH = 7 + 1/2 (pK_a -pK_b)`
pH is independent of concentration of acid and base