Autoprotolysis constant | Article about autoprotolysis constant by The Free Dictionary
autoprotolysis constant[‚ȯd·ō·prə′täl·ə·səs ′kän·stənt]
A constant denoting the equilibrium condition for the autoprotolysis reaction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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As far as autoprotolysis constant
(N,N- dimethyl formamide (pKs = 18.0) Greater than acetonitrile (pKs = 33.0) Greater than isopropyl alcohol (pKs = 20.6) Greater than t-butyl alcohol (pKs = 22.0)), all compounds show the weakest acidic properties in N,N-dimethyl formamide, isopropyl alcohol and t-butyl alcohol but show the strongest acidic properties in acetonitrile.
The autoprotolysis constant
of AN is very low: [pK.sub.auto] [greater than or equal to] 33  (even values of [pK.sub.auto] as high as 44 have been suggested [16, 23]), which makes it a good differentiating solvent.
It has a relatively high dielectric constant (e = 36) and a small autoprotolysis constant
(pKs = 33.6).
TABLE 1: The autoprotolysis constants
([K.sub.ap]) obtained for various water-solvent mixtures.