Problem: 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. Using the equation above, calculate the quotient [A-]/[HA] at pH           (a) 4.556          (b) 5.454          (c) pH 4.874

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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. 

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

          (a) 4.556

          (b) 5.454

          (c) pH 4.874