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A buffer solution is prepared by mixing ...

A buffer solution is prepared by mixing 10 mL of 1.0 M acetic acid and 20 mL of 0.5 M sodium acetate and then diluted to 100 mL with distilled water, The pH of the buffer solution is (`pK_(a)` of acetic acid is 4.76 )

A

4.84

B

5.21

C

4.34

D

4.76

Text Solution

Verified by Experts

The correct Answer is:
D
Milliequivalents of acetic acid = 10 mL `xx 1.0`M
`"Milliequivalents of sodium acetate" = 2.0 mL xx 0.5 M `
From Henderson equation,
pH = `pK_(a) + log [("salt")/("acid") ] `
here, ` " " pK_(a) = 4.76 " " [ " for acetic acid " ]`
`therefore " " pH = 4.76 + log ( (0.5 xx 20)/(10 xx 1.0))`
pH = 4.76
Hence, option (d) is correct .
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