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noun, Chemistry.
a white, crystalline, water-soluble powder, Na 2 S 2 O 4 , used as a reducing agent, especially in dyeing, and as a bleach.


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  • Sodium-hypochlorite

    noun, Chemistry. 1. a pale-green, crystalline compound, NaOCl, unstable in air, soluble in cold water, decomposes in hot water: used as a bleaching agent for paper and textiles, in water purification, in household use, and as a fungicide. sodium hypochlorite n. An unstable salt usually stored in solution and used as a fungicide and an […]

  • Sodium-hyposulfite

    noun, Chemistry. 1. sodium thiosulfate.

  • Sodium hyposulphite

    noun 1. another name (not in technical usage) for sodium thiosulphate

  • Sodium-iodide

    noun, Chemistry. 1. a colorless or white, crystalline, deliquescent, water-soluble solid, NaI, used chiefly in the manufacture of photographic emulsions, in organic synthesis, and as a disinfectant in veterinary medicine.

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