Sulfurous acid

The sulfurous acid . Colorless liquid with a suffocating sulphurous odor, formula H 2 SO 3 . It is one of those responsible for Acid Rains .


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  • 1 Properties
  • 2 Industrial Applications
  • 3 Medical Applications
  • 4 Sources


It is unstable and only exists in solution. It is soluble in water and in alcohol . It is highly corrosive and a powerful reducing agent.

It is formed in nature by the combination of Sulfur Dioxide (SO 2 ), generally emitted by large factories, with existing water in the atmosphere. Later it returns to the earth forming part of the so-called Acid Rains .

In the form of a gas it is colorless, with a pungent odor. It liquefies at -10 ° C and solidifies at -76 ° C

Industrial applications

  • Disinfection of premises, although its action is not very intense.
  • It was used as a rodenticide, although it was replaced by Hydrocyanic Acid and its derivatives.


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