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  • 50 Kg Barrel
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CAS number: 7775-14-6
PubChem: 24489
EC Number: 231-890-0
UN number: 1384
Chebi: 66870
RTECS number: JP2100000
Molecular formula: Na2S2O4
Molar mass: 174,107 g / mol (anhydrous) 210,146 g / mol (dihydrate)
Appearance: grayish crystal powder white light-lemon colored flakes
Odor: pale sulfur smell
Density: 2.38 g / cm3 (anhydrous) 1.58 g / cm3 (dihydrate)
Melting point: 52 ° C, 325 K, 126 ° F
Boiling point: decomposable
Solubility in water: 18.2 g / 100 mL (anhydrous, 20 ° C) 21.9 g / 100 mL (Dihydrate, 20 ° C)
Solubility: slightly soluble in alcohol
Other names: Sodium dithionite

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General Information

The chemical formula is Na2S2O4, which is also known as Nahs. They are not soluble in alcohol when dissolved in water. The solutions are acidic and reductive and the product is stable under normal atmospheric conditions but decomposes in hot water or acid. Thanks to the air in the atmosphere, H2S has a similar odor.

Production and Reactions

In the laboratory environment, hydrogen sulphate, sodium methoxide, NaOMe treatment can be provided.

NaOM + H2S? Nahs + MeOH

This compound is hydrogen sulfide semi-neutralization product with sodium hydroxide.

It can form salts with organic amines.

Usage areas

It is used to bleach sherbet and maltose in food industry.

It is also used as a sulphonation agent and sodium source in the production of chemical substances and also for the purification of gases.

It is used in textile industry for bleaching textile materials.

It is used as reducing agent by improving the reductive decomposition of dye excess and color stability in dyeing products.

It is used in the paper sector for the bleaching of paper without affecting the strength of the paper.

Apart from these, it is widely used as a flotation agent in the extraction of copper, bleaching of kaolin clay and foodstuffs in the bleaching of minerals by the removal of iron ions in boat painting and water conditioning.

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