ChemistryMedium73×since 2002Q1310A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of [CH3CH2COO−][CH3CH2COOH]{{[C{H_3}C{H_2}CO{O^ - }]} \over {[C{H_3}C{H_2}COOH]}}[CH3CH2COOH][CH3CH2COO−] required to make buffer is ___________. Given : Ka(CH3CH2COOH)=1.3×10−5{K_a}(C{H_3}C{H_2}COOH) = 1.3 \times {10^{ - 5}}Ka(CH3CH2COOH)=1.3×10−5A0.03B0.13C0.23D0.33Check answerSkip