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pKa

Last updated

Feb 28, 2022
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- Pinacol Rearrangement
- Plane of Symmetry

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Many organic species are very weakly acidic in water. Hence, their acid dissociation constants are small and tedious to work with. The quantity pK_a is an attempt to solve this problem.

pK_a of a species is defined as follows:

pK_a = –logK_a

By definition, the larger the K_a of a species, the smaller its pK_a.

eg:

As is evident from the above numbers, it is more convenient to work with pK_a values than with K_a values when K_a values are very small.

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