sulfurous acid

n. A colorless solution of sulfur dioxide in water, H₂SO₃, characterized by a suffocating sulfurous odor, used as a bleaching agent, preservative, and disinfectant.

sul′furous ac′id

n. a colorless liquid, H₂SO₃, having a suffocating odor, used chiefly in organic synthesis and as a bleach. [1780–90]

Translations

Sulfurous Acid

sulfurous acid

[′səl·fə·rəs ′as·əd] (inorganic chemistry) H₂SO₃ An unstable, water-soluble, colorless liquid with a strong sulfur aroma; derived from absorption of sulfur dioxide in water; used in the synthesis of medicine and chemicals, manufacture of paper and wine, brewing, metallurgy, and ore flotation, as a bleach and analytic reagent, and to refine petroleum products.

Sulfurous Acid

H₂ SO₃, a weak dibasic acid, corespond-ing to the + 4 oxidation state of sulfur. Sulfurous acid is known only in dilute aqueous solutions. Its dissociation constants are K₁ = 1.6 X 10^-2 and K₂ = 1.0 X 10^-7(18°C). It gives two series of salts: normal salts—sulfites—and acidic salts—hydrosulfites. Sulfurous acid is a strong reducing agent, and its solutions, when left exposed to the air, are gradually converted into H₂ SO₄. In reactions with stronger reducing agents, for example, H₂ S, the acid behaves as an oxidizing agent. Sulfurous acid is obtained by dissolving SO₂ in water. The following equilibria exist simultaneously in aqueous solutions:

The products obtained by adding sulfurous acid to organic dyestuffs are colorless or only slightly colored. This result explains the use of sulfurous acid in bleaching those materials that cannot withstand the action of such strong oxidizing agents as chlorine and hypochlorites.

sulfurous acid

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

H₂SO₃, an inorganic acid and a powerful chemical reducing agent used commercially, esp. for as a bleach. CAS # 7782-99-2See also: acid

单词	sulfurous acid
释义	sulfurous acid sulfurous acid n. A colorless solution of sulfur dioxide in water, H₂SO₃, characterized by a suffocating sulfurous odor, used as a bleaching agent, preservative, and disinfectant. sul′furous ac′id n. a colorless liquid, H₂SO₃, having a suffocating odor, used chiefly in organic synthesis and as a bleach. [1780–90] Translations Sulfurous Acid sulfurous acid [′səl·fə·rəs ′as·əd] (inorganic chemistry) H₂SO₃ An unstable, water-soluble, colorless liquid with a strong sulfur aroma; derived from absorption of sulfur dioxide in water; used in the synthesis of medicine and chemicals, manufacture of paper and wine, brewing, metallurgy, and ore flotation, as a bleach and analytic reagent, and to refine petroleum products. Sulfurous Acid H₂ SO₃, a weak dibasic acid, corespond-ing to the + 4 oxidation state of sulfur. Sulfurous acid is known only in dilute aqueous solutions. Its dissociation constants are K₁ = 1.6 X 10^-2 and K₂ = 1.0 X 10^-7(18°C). It gives two series of salts: normal salts—sulfites—and acidic salts—hydrosulfites. Sulfurous acid is a strong reducing agent, and its solutions, when left exposed to the air, are gradually converted into H₂ SO₄. In reactions with stronger reducing agents, for example, H₂ S, the acid behaves as an oxidizing agent. Sulfurous acid is obtained by dissolving SO₂ in water. The following equilibria exist simultaneously in aqueous solutions: The products obtained by adding sulfurous acid to organic dyestuffs are colorless or only slightly colored. This result explains the use of sulfurous acid in bleaching those materials that cannot withstand the action of such strong oxidizing agents as chlorine and hypochlorites. sulfurous acid 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 H₂SO₃, an inorganic acid and a powerful chemical reducing agent used commercially, esp. for as a bleach. CAS # 7782-99-2See also: acid ThesaurusSeeacid
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