8.3 The pH scale

The pH scale

  • pH scale is effective way of representing concentration of hydrogen ions [H+] in a solution
  • It is a logarithmic scale with base 10, easy way for non-scientist to understand safety of materials
  • pH distinguishes between acidic, neutral and alkaline


Calculating pH

  • The concentration of an acid with one proton is the same as the concentration of hydrogen ions [H+]
    • [HCl] = [H+]
  • For more protons:
    • [H2SO4] = 2[H+]

Ionization of water



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