a) From the Henderson-Hasselbalch equation:
where [HA] = formic acid
[A–] = formate
pKa = 3.75
pH = 5.75
What is the ratio of [A–]/[HA] at pH 5.75? The pKa of formic acid (methanoic acid, H–COOH) is 3.75.
Draw the structure for formic acid.
Draw the structure of the conjugate base for formic acid.
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