KVPY 2020-21 SB SX Exam Previous Papers

Question : 50 of 120

Marks: +1, -0

A weak acid is titrated with a weak base.
Consider the following statements 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 statements are :-

only (i) and (iii)
only (i) and (iv)
only (ii) and (iii)
only (ii) and (iv)

Validate

Solution:

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

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