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pH Formula

Identify pH as -log10 [H+] and explain that a change in pH of 1 means a ten-fold change in [H+]



  • The pH of a solution is defined as the negative logarithm (to base 10) of the concentration of hydrogen ions:
  • As the scale is to the base of ten, a change in pH of 1 corresponds to a ten-fold change in the concentration of hydrogen ions.


The pH scale (take note of hydrogen ion concentration, highlighted in purple)

Image taken from http://www.isa.org/Images/InTech/2005/May/20050514sens.gif

Easychem - pH Formula



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