sulfurous acid

sulfurous acid

noun Chemistry.
a colorless liquid, H2SO3, 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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sulfurous acid is always a great word to know.
So is yield. Does it mean:
a preparation containing an insoluble dye converted by reduction into a soluble leuco base, or a vessel containing such a preparation
the quantity of product formed by the interaction of two or more substances, generally expressed as a percentage
American Heritage
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.
The American Heritage® Science Dictionary
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