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sulfurous acid

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sulfurous acid /sul·fur·ous ac·id/ (sul´fūr-us)
1. a solution of sulfur dioxide in water, H2SO3; used as a reagent.

sulfurous acid (H2SO3)
[sul′fərəs]
a weak inorganic acid formed by dissolving sulfur dioxide in water, used as a chemical-reducing and bleaching agent. It has been used in medicine in skin lotions and nasal and throat sprays. Sulfites formed by the acid may be included in antiseptics, antifermentatives, and antizymotics. Sulfurous acid is stable only in aqueous solutions. It decomposes into sulfur dioxide and water on standing. It is a major component of acid rain.


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One of those pathways, as you mention, first creates sulfurous acid that then reacts with oxygen to make sulfuric acid In the other set of reactions, sulfur dioxide reacts with oxygen to make sulfur trioxide, which then reacts with water to create sulfuric acid.
The causative agent in most cases has proved to be sulfurous acid ([H.
This concentrate is readily leached in only 6 hours of agitation at 70o C at atmospheric pressure with low consumption of sulfurous acid.
 
 
 
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