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. 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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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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