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How much sodium acetate should be added ...

How much sodium acetate should be added to a 0.1 M solution of `CH_(3)COOH` to give a solution of pH = 5.5 (`pK_(a)` of `CH_(3)COOH = 4.5`)

A

0.1 M

B

0.2 M

C

1.0 M

D

10.0 M

Text Solution

Verified by Experts

The correct Answer is:
C
`pH=pK_(a)+log .([CH_(3)CO ONa])/([CH_(3)CO OH])`
`5.5=4.5+log .([CH_(3)CO ONa])/(0.1)`
`=4.5 + log [CH_(3)CO ONa]+1`
or` log [CH_(3)CO ONa]=0`
`:. [CH_(3)CO ONa]=1M`
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