What ratio of acetic acid to sodium acetate concentration is needed to achieve a buffer whose pH is 5.70? The dissociation constant of acetic acid is 1.8×10−5.
pH=pKa+log[Salt][Acid]
5.7=5−log(1.8)+log[Salt][Acid]
5.7=5−0.255+log[Salt][Acid]
0.955=log[Salt][Acid]
⟹[Salt][Acid]=9