Sodium hydrosulfite (Na2S2O4)-Powder introduce:
Sodium dithionite (also known as sodium hydrosulfite) is a white crystalline powder with a weak sulfurous odor. Although it is stable in the absence of air, it decomposes in hot water and in acid solutions.
Molar mass: 174.107 g/mol (anhydrous);210.146 g/mol (dihydrate)
Appearance: white to grayish crystalline powder;light-lemon colored flakes
Odor: faint sulfur odor
Density: 2.38 g/cm3 (anhydrous);1.58 g/cm3 (dihydrate)
Melting point: 52 °C (126 °F; 325 K)
Boiling point: Decomposes
Solubility in water:18.2 g/100 mL (anhydrous, 20 °C);21.9 g/100 mL (Dihydrate, 20 °C)
Solubility:slightly soluble in alcohol
Sodium hydrosulfite is used as a reducing agent in aqueous solutions, sulfonating agent , chelating agent and decolorizing agent in organic reactions. It finds application in water treatment, gas purification, cleaning, leather, polymers, photography, and many others. It is involved in chemical enhanced oil recovery to stabilize polyacrylamide polymers against radical degradation in the presence of iron. It plays an important role to determine the iron content in soil chemistry.
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