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Q.

A buffer solution contain 0.36M Sodium acetate (CH3COONa) and 0.45M Acetic acid(CH3COOH), pKa=4.8. What is the pH of this buffer solution ?

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a

4.7

b

6.1

c

3.8

d

5.2

answer is A.

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Detailed Solution

PH=pKa+log (saltacid)PH=4.8+log(0.360.45)4.8+log (3645)4.8+log(45)4.8+(log 4−log 5)4.8−(0.6020−0.6989)4.8−0.0969⇒ PH=4.7031

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