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= -log10^(-5)+log``([Salt])/([Acid])`
`6= 5log 10+ log``([Salt])/([Acid])`, `6=5+log``([Salt])/([Acid])`
`log``([Salt])/([Acid])=6-5=1` , `([Salt])/([Acid])=(10)/(1)`