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What amount of solution propanoate shoul...

What amount of solution propanoate should be added to one litre of an aqueous solution containing `0.02` mole of propanoic acid (`K_(a)=1.0xx10^(-5)` at `25^(@)C`) to obtain a buffer solution of `pH 6`

A

`0.1 M`

B

`0.2 M`

C

`0.3 M`

D

`1.3 M`

Text Solution

Verified by Experts

The correct Answer is:
B
Using the expression
`pH=pK_(a)+log``(["Salt"])/([Acid])`
We get, `6= -log(1.0xx10^(-5))+log ``(["Salt"])/([0.02 M])`
Which gives `6=5+log``(["Salt"])/([0.02 M])`
or `(["Salt"])/([0.02 M])=10` or `["Salt"]=0.2 M`
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