sulfurous acid

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sul·fu·rous ac·id

(sŭl'fŭ-rŭs as'id),
A solution of about 6% sulfur dioxide in water; used chiefly as a disinfectant and bleaching agent; has been used externally for its parasiticidal effect in various skin diseases.

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)

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.

sulfurous acid

H2SO3, an inorganic acid and a powerful chemical reducing agent used commercially, esp. for as a bleach.
CAS # 7782-99-2
See also: acid
References in periodicals archive ?
Sulfurous acid is most often used for this purpose for soils (Nelson and Sommers 1996), whereas removal of carbonates from other environmental materials (e.
When sulfur dioxide dissolves in water, it produces sulfurous acid, not sulfuric.
These articles, originating from about 1835 to 1845, include such topics as inorganic neutral oxysalts in general and phosphates, arseniates, phosphites and arensites in particular, the reaction and products of sulfurous acid and iron or zinc, nitric sulphate oxide and experimental demonstrations proving its non-existence, the nature of Aqua Regia, reciprocal actions of sulfurous and hyponitric acids, observations on the Theory of Peligot, the function of water, the formulation of hypoiodous acid, the existence of double salts in codeine and morphine, and the quantitative determination of chlorine and hydrochloric acid when the two gases occur together.
Of the compounds tested, sulfurous acid showed the greatest toxicity in all three types of cells, whereas sodium nitrate showed the least.