The properties of acids and bases were well known long before there was a workable theory that explained and predicted their behaviour. Early theories of acids and bases were proposed by men like:
  • Antoine Lavoisier: Proposed that oxygen created the acidic properties and that acids were combinations of oxides and water.
    • Explains why carbonated water (CO2 (g) in water ) is acidic
    • Could not explain why MgO is a base.
  • Sir Humphrey Davy: Proposed that hydrogen was responsible for the acidic properties of acids.
    • Explains why HCl is acidic or HNO3 is acidic.
    • Could not explain why NH3 is base
  • Svante Arrhenius: (see below)
Each of the above theories explained some of the properties of acids and bases but failed either to include all known acids and bases, or correctly explain some of the known behaviours of acids and bases.

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Arrhenius Theory
The first modern theory of acids and bases was presented by Svante Arrhenius , click on the magnifying glass on the left and complete a study of his theory

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Click on the flash icon to watch a presentation that depicts how Arrhenius viewed the dissolving of HCl gas into water.