Synthesis of sodium dithionite

Preparation of sodium dithionite dihydrate

Preparation of sodium dithionite dihydrate

Preparation of sodium dithionite dihydrate

10 g of zinc (a grade of at least 100 mesh should be used; zinc “dust” is not suitable because of its high content of oxide) are employed in 100ml of water. Sulfur dioxide is passed in at 0°C until all the zinc has dissolved. The reddish solution is filtered under inert atmosphere, and 75g of sodium acetate 3-hydrate are dissolved in the cold filtrate. The reaction mixture is stored in the refrigerator under nitrogen in a tightly stoppered bottle. Crystallization is aided by shaking and is complete after about 3 days. The crystalline product is filtered by suction under nitrogen and drained well. It is then washed thoroughly with 150ml of warm (50°C) absolute alcohol, dried, and stored in tightly stoppered bottles under an indifferent atmosphere. Yield about 25g.

Inorganic laboratory preparations, by G. G. Schlessinger, 73, 1962



InChI Key


Canonical SMILES


MeSH Synonyms

Dithionite, Dithionite, Sodium, Hyposulfite, Sodium Dithionite

Depositor-Supplied Synonyms

Sodium dithionite, SODIUM HYDROSULFITE, Disodium dithionite, Vatrolite, 7775-14-6, Sodium sulfoxylate, Sodium hypodisulfite, Sodium hydrosulphite, Dithionous acid, disodium salt, Blankit, Burmol, Hydros, sodiumdithionite, Blankit IN, V-Brite B, Disodium hydrosulfite, Hydrosulfite R Conc, Caswell No. 774, UNII-2K5B8F6ES1, CCRIS 1428, HSDB 746, Sodium hydrosulfite (Na2S2O4), Sodium dithionite (Na2(S2O4)), EINECS 231-890-0, Dithionous acid, sodium salt (1:2), UN1384, EPA Pesticide Chemical Code 078202, 1340-77-8, Hydrolin, sodiumhydrosulfite, Virtex L, sodium hydro sulfite, ACMC-20ajod, D-Ox, AC1L2NGY, AC1Q1UWY, sodium sodium hydrosulfite, disodium sulfinatosulfinate, Na2S2O4, KSC377C1N, 2K5B8F6ES1, 71699_FLUKA, 71699_SIGMA, CHEBI:66870, CTK2H7116, JVBXVOWTABLYPX-UHFFFAOYSA-L, MolPort-003-926-324, 157953_SIAL, AKOS015904498, RP23608, RTR-024814, TRA0070045, Sodium dithionite or sodium hydrosulfite, AN-18175, BP-13393, IN000595, IN018804, S300, SC-74740, KB-259854, LS-186365, FT-0695294, S0562, 3B4-2469, I14-16494, Sodium dithionite or sodium hydrosulfite [UN1384] [Spontaneously combustible], Sodium dithionite or sodium hydrosulfite [UN1384] [Spontaneously combustible]

Removed Synonyms

Hydrosulfite, Sulfoxylate, Reductone, Sodium dithionate, Sodium hyposulfite, Disodium dithionate, CID24489

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