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IEVref:114-01-20ID:
Language:enStatus: Standard
Term: ion activity
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Symbol: a
Definition: ratio of the product of ion molality b and a correction factor γ to the molality b° of the same ion in a standard solution under standardized conditions

a =  / b°

Note 1 to entry: The correction factor is called activity coefficient and it is determined experimentally.

Note 2 to entry: Normally a standard solution is a solution of the ion at a molality of 1 mol/kg (exactly). Standardized conditions are normally 1 013,25 hPa and 25 °C.

Note 3 to entry: This entry was numbered 111-15-26 in IEC 60050-111:1996. It has been modified.


Publication date:2014-03
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