pH value

Synonyms:
  • pH
German: pH-Wert
Japanese: pH値

Chemistry. The hydrogen ion concentration [H+] used as a measure of the acidity or alkalinity of a solution on a scale of 0-14. Numerically the pH is approximately equal to the negative logarithm of hydrogen ion concentration expressed in molarity. pH 7 is neutral, above 7 is alkaline and below is acidic.

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