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 pH
  • pH
  • A scale ranging from 0 to 14, which is used to determine how acidic or basic a substance is. The pH of a substance is determined by taking the negative of the logarithm of the molar hydrogen-ion concentration (pH=-log [H+]). Pure water has a pH of 7. Substances with a pH less than 7 are acids and substances with a pH greater than 7 are bases.


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