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SODIUM HYDROSULFITE | ||
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PRODUCT IDENTIFICATION |
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| CAS NO. | 7775-14-6 |
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| EINECS NO. | 231-890-0 | |
| FORMULA | Na2 O4 S2 (Sodium Dithionite) | |
| MOL WT. | 174.10 | |
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HS CODE |
2831.10 | |
| TOXICITY |
Oral Rat LD 50: 5 g/kg. | |
| SYNONYMS | Sodium dithionite; Reductone; Vatrolite; | |
| Sodium sulfoxylate; Dithionous acid,disodium salt; Sodium dithionite hydrate; | ||
| DERIVATION | ||
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CLASSIFICATION |
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PHYSICAL AND CHEMICAL PROPERTIES |
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| PHYSICAL STATE | White crystalline powder with weak sulforous odor | |
| MELTING POINT | 52C | |
| BOILING POINT | Decomposes | |
| SPECIFIC GRAVITY | 2.19 - 2.20 | |
| SOLUBILITY IN WATER | Soluble (insoluble in alcohol) | |
| pH | Acidic in solution | |
| VAPOR DENSITY | ||
| AUTOIGNITION |
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| NFPA RATINGS |
Health: 2; Flammability: 3; Reactivity: 1 | |
| REFRACTIVE INDEX |
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| FLASH POINT | 90 C | |
| STABILITY | Stable under ordinary conditions (Decomposes in hot water and acid) | |
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APPLICATIONS |
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| Sodium Hydrosulfite is a white powder. Commercial sodium hydrosulfite contains 85% - 90% sodium dithionite w/w. It is readily soluble in water and shows powerful reducing action in aqueous solutions. Sodium hydrosulfite is used as a reducing agent in dying application. It undergoes reduction reaction with water-insoluble vat dye and sulfur dye to form water-soluble alkali metal salt of the dye (leuco form ) so that they have affinity for the textile fiber. The reductive decomposition of the excessive dye by sodium hydrosulfite improve the colour fastness. Sodium hydrosulfite's reduction reaction removes residual oxide and wrong pigments. Sodium hydrosulfite is a reductive bleaching agent. It reduces carbonyl and alcohol groups, which function as colorants of the substances. It is used in bleaching mechanical paper pulp, cotton, wool and kaolin clay. Additional applications include water treatment, leather processing, food processing, gas purification, cleaning, printing and stripping. In addition to a reducing agent function, sodium hydrosulfite functions as a sulfonating agent and sodium ion source in a variety of chemical reactions. | ||
| SALES SPECIFICATION | ||
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APPEARANCE |
White to Gray-White crystalline powder | |
| Na2 O4 S2 |
85% or 88% or 90% min | |
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INSOLUBLES IN WATER |
0.1% max | |
Na2S2O3 |
1.2% max | |
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Na2S2O5 |
5-7% | |
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NaHSO3 |
0.5% max | |
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Na2CO3 |
0.6-2% | |
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HCOONa |
0.5% max | |
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Zn |
0.0001% max | |
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Pb |
0.0001% max | |
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Fe |
0.005% max | |
| TRANSPORTATION | ||
| PACKING | 50kgs , 100kgs in Steel Drum | |
| HAZARD CLASS |
4.2 | |
| UN NO. | 1384 | |
| OTHER INFORMATION | ||
| Hazard Symbols: XN, Risk Phrases: 22-31-7, Safety Phrases: 7/8-26-28A-43 | ||
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SULFURIC SALTS |
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Sulfate (also spelled sulphate in Europe) is any chemical compound containing the SO42- ion related to sulfuric acid (H2SO4). Sulfates are salts or esters of sulfuric acid, formed by replacing one or both of the hydrogens with a metal or a radical as in sodium sulfate, Na2SO4. Sulfates in which both hydrogens are replaced are called normal sulfates. Bisulfate is a compound that has the HSO4- radical. Bisulfate (called also hydrogen sulfate or acid sulfate) is a compound formed by replacing only one hydrogen in sulfuric acid. Sulfite (also sulphite) is a compound that contain the sulfite ion SO32-. Sulfites are salts or esters of sulfurous acid (H2SO3), formed by replacing one or both of the hydrogens with a metal or a radical as in sodium sulfite, Na2SO3. Sulfites in which both hydrogens are replaced are called normal sulfites. Bisulfite is a compound that has the HSO3- radical. Bisulfate (called also hydrogen sulfite or acid sulfite) is a compound formed by replacing only one hydrogen in sulfurous acid. The term of 'meta' or 'pyro' is the chemical prefix for oxo acid formed through the loss of one water molecule (dehydration) from two molecules of ortho acid by heating. Pyrosulfuric acid is an example ( 2H2SO4 - H2O = H2S2O7). Ortho acid is the compound fully hydrated acid or its salts. Orthophosphoric acid is an example (2·H3PO4 = P2O5.3H2O), in contrast to the less hydrated form, pyrophosphoric acid (2·HPO3 = P2O5.H2O). Na2O5S2 is called sodium metabisulfite (2·HNaO3S - H2O). Sulfide is a compound having one or more sulfur atoms in which the sulfur is connected directly to a carbon, metal, or other nonoxygen atom; for example sodium sulfide, Na2S. Sulfide ion is S2- with oxidation number -2. Bisulfide ion is an anion formed by two sulfur atoms having an overall -2 charge, (S2)2-. Sulfamate is a salt of sulfamic acid (HSO3NH2). Calcium sulfamate Ca(SO3NH2)2 is an example. |
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