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 = -log K_(a) + log .(["Salt"])/(["Acid"]), 6 = -log 10^(-5) + log .(["Salt"])/(["Acid"])`
`6 = 5 log 10 + log .(["Salt"])/(["Acid"]), 6 = 5 + log .(["Salt"])/(["Acid"])`
`log .(["Salt"])/(["Acid"]) = 6 =5 = 1, (["Salt"])/(["Acid"]) = (10)/(1)`.