sulfurous-acid

sulfurous acid

noun Chemistry.
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.

Origin:
1780–90

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Science Dictionary
sulfurous acid  
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: H2SO3.
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