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IEVref:114-01-21ID:
Language:enStatus: Standard
Term: pH
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Definition: number quantifying the acidic or the alkaline character of a solution, equal to the negative of the decimal logarithm of ion activity aH+ of the hydrogen cation H+

pH = −10 lg aH+

Note 1 to entry: At about 25 C aqueous solutions with:

  • pH < 7 are acidic;
  • pH = 7 are neutral;
  • pH > 7 are alkaline.

At temperatures far from 25 C the pH of a neutral solution differs significantly from 7.

Note 2 to entry: For more details, see ISO 80000-9:2009, Annex C.

Note 3 to entry: This entry was numbered 111-15-37 in IEC60050-111:1996. It has been modified.


Publication date:2014-03
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Internal notes:2017-08-28: Removed unnecessary <p> tags. LMO
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