Aqueous-phase pKa of the methyl group in acetic acid
Abstract
The gas-phase acidity of the α-hydrogens of acetic acid and
the
aqueous-phase pK
a
of ethyl acetate are
combined with other literature values in a thermodynamic cycle to
provide
the aqueous-phase pK
a
of the methyl group of acetic
acid as 22.7 ± 1.0 and the pK
a
of
the
enol of acetic acid as 3.3 ± 1.0.
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