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0.01 mole of NaOH is added to 1 litre of...

0.01 mole of NaOH is added to 1 litre of a buffer solution which contains 0.1 M acetic acid and 0.1 M sodium acetate If the pKa value of acetic acid is 4.76, the pH of the solution is

A

`4.76`

B

` lt 4.76`

C

`7.6`

D

` gt 4.76`

Text Solution

Verified by Experts

The correct Answer is:
D
Initially `pH = pka + log. (["salt"])/(["acid"])`
`pH = 4.76 +log. (0.1)/(0.1)`
`pH = 4.76 +log 1 `
`pH = 4.76 " " :. " log " 1 = 0 `
After adding 0.01 mol of NaOH in
`1 L = (0.01)/1 = 0.01 ` mol.
Conc . Of salt slightly increases
So `pH gt 4.76`
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