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autoprotolysis constant definition

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The product of the activities (or, more approximately, concentrations) of the species produced as the result of autoprotolysis. For solvents in which no other ionization processes are significant the term is synonymous with "ionic product". The autoprotolysis constant for water, Kw, is equal to the product of activities

a(H3O+)a(OH-) = 1.0 x 10-14 at 25 oC.

See also:

atomic force microscopy (AFM) definition
atmosphere (atm) definition
Bacteriochlorophyll definition
Axis of Helicity definition
Asymmetry parameter definition