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))`

Options

A. `1:10`
B. `10:1`
C. `100:1`
D. `1:100`

Answer

B

Explanation

`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 `