Amphiprotic Substances

Identify amphiprotic substances and construct equations to describe their behaviour in acidic and basic solutions



  • Amphiprotic substance: A molecule or ion that can behave as either a proton donor or a proton accepter.
  • Water is an example of an amphiprotic substance:
    • Can act as an acid (lose a hydrogen ion):
    • Can act as a base (gain a hydrogen ion):
  • The hydrogen carbonate ion (HCO3-) is an example of an amphiprotic substance:
    • Can act as an acid (lose a hydrogen ion):
    • Can act as a base (gain a hydrogen ion):
  • Other examples of amphiprotic substances are the hydrogen sulfate ion (HSO4-), the hydrogen phosphate ion (HPO4-), and the hydrogen sulfide ion (HS-).

Easychem - Amphiprotic Substances


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