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.
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How to use sulfurous acid in a sentence
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.
Scientific definitions for 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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