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For preparing a buffer solution of pH 6 ...

For preparing a buffer solution of `pH 6` by mixing sodium accetate and acetic, the ratio of the concentration of salt and acid should be `(K_(a)=10^(-5))`

A

`1:10`

B

`10:1`

C

`100:1`

D

`1:100`

Text Solution

Verified by Experts

The correct Answer is:
B
`K_(a) = 10^(-5) , pH = 6`
`pH = - logK_(a) +log (["Salt"])/(["Acid"]) , 6 = - log 10^(-5) + lg (["Salt"])/(["Acid"])`
` 6 = 5 log 10 + log. (["salt"])/(["Acid"]) , 6 = 5+ log . (["Salt"])/(["Acid"])`
`log. (["Salt"])/(["Acid"]) = 6-5 = 1 , (["salt"])/(["Acid"]) = 10/1 `
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