Title: Sodium Dithionate
CAS Registry Number: 7631-94-9
CAS Name: Dithionous acid disodium salt
Molecular Formula: Na2O6S2
Molecular Weight: 206.11
Percent Composition: Na 22.31%, O 46.58%, S 31.11%
Literature References: Prepd according to the equations MnO2 + 2SO2 ® MnS2O6 and MnS2O6 + Na2CO3 ® MnCO3 + Na2S2O6: de Baat, Rec. Trav. Chim. 45, 237 (1926); Pfanstiel, Inorg. Synth. 2, 170 (1946).
Derivative Type: Dihydrate
Properties: Colorless, water-clear, orthorhombic crystals. Very stable in air. d 2.189. Loses all of its water of crystn at 110°. When heated to 267° it is dissociated into Na2SO4 and SO2. Soly in water at 0°: 6.05% (w/w); at 20°: 13.39%; at 30°: 17.32%. Insol in alc.
Density: d 2.189
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