What should be the ratio of concentration of acetic acid to sodium acetate while preparing an acid buffer mixture with pH = 5.7? (`K_(a)` for acetic acid is `1.8xx10^(-5)`)

Explanation

`pK_(a)=-logK_(a)`
= `-log1.8xx10^(-5)`
= +4.6447
`pH=pK_(a)+"log"(["Salt"])/(["Acid"])`
`5.7=4.7447+"log"(["Salt"])/(["Acid"])`
`"log"(["Salt"])/(["Acid"])=5.7-4.7447=0.9553`
`(["Salt"])/(["Acid"])="anti"log0.9553=9.02~~9`
`therefore` Ratio of concentration of acid : salt = 1 : 9