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Write the Henderson-Hasselbalch equation for a propanoic acid solution (CH_{3}CH_{2}CO_{2}H, pK_{a} = 4.874) using the symbols HA and A^{-}, and the given pK_{a} value for propanoic acid in the expression.

Using the equation above, calculate the quotient [A^{-}]/[HA] at pH

(a) 4.556

(b) 5.454

(c) pH 4.874