Write the Henderson-Hasselbalch equation for a propanoic acid solution (CH3CH2CO2H, pKa = 4.874) using the symbols HA and A -, and the given pKa value for propanoic acid in the expression.
pH = pKa + log [A-] / [HA]
Using the equation above, calculate the quotient [A-] / [HA] at
a) pH 4.112.
b) pH 4.874.
c) pH 5.115.
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