sulfurous acid(redirected from H 2 SO 3)
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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.
2. sulfur dioxide.
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.
H2SO3, an inorganic acid and a powerful chemical reducing agent used commercially, esp. for as a bleach.
CAS # 7782-99-2
See also: acid