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Is there an online database of acid and basic dissociation constants, all in one place, free to use?

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There are a number of resources available that provide dissociation constants for acids and bases. The following are examples:

UC Davis Chemwiki pages E1: Acid Dissociation Constants at 25°C and E2. Base Dissociation Constants at 25°C provide many examples. These are based on information taken from CRC Handbook of Chemistry and Physics, 85th Edition.

The WikiBook Chemical Principles/Solution Equilibria: Acids and Bases provides a reasonable database of dissociation constants of acids and bases (Tables 5.3 and 5.4), as well as some further information about how the values are calculated.

The California State University webpage p-functions for common acids and bases, also at 25C, of a series of acids and bases.

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The Evans' and Bordwell $pK_a$ tables provide an excellent source of data for water and DMSO based measurements, particularly for organic compounds.

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