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sulfurous acid

noun

, Chemistry.
  1. a colorless liquid, H 2 SO 3 , having a suffocating odor, obtained by dissolving sulfur dioxide in water, known mainly by its salts, which are sulfites: used chiefly in organic synthesis and as a bleach.


sulfurous acid

  1. A colorless solution of sulfur dioxide in water, characterized by a suffocating sulfurous odor. It is used as a bleaching agent, preservative, and disinfectant. Chemical formula: H 2 SO 3 .


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Word History and Origins

Origin of sulfurous acid1

First recorded in 1780–90
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Example Sentences

If sulfurous acid is present, it will be oxidized to sulfuric acid and precipitated as barium sulfate by the barium chlorid.

If sulfurous acid is present a deep blue color forms at once.

Free sulfurous acid is not largely used as a food preservative, though its salts are quite commonly employed.

If a precipitate forms on the addition of barium chlorid the presence of sulfurous acid is indicated.

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