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))

What should be the ratio of concentration of acetic acid to sodium ace

1.	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))
Answer» Solution :`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