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The pH of a 0.01 M solution of a monobas...

The `pH` of a `0.01 M` solution of a monobasic acid is four. Which one of the following statement about the acid is incorrect

A

When a little NaOH is added, it will form a buffer solution

B

It is a weak acid

C

It’s sodium salt will be acidic

D

It’s sodium salt will be basic

Text Solution

Verified by Experts

The correct Answer is:
C
Concentration of monobasic acid =0.01 M pH = 4
If the acid is completely ionised the pH of the acid would be
pH =-log 0.01
`= -log 10^(-2)=2
So it is a weak acid. The sodium salt of a weak acid when dissolved the anions will be hydrolysed giving rise to OH– ion concentration. The solution will be basic. So statement (C) is incorrect.
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