Sodium dithionite

Sodium dithionite
Names
	Other names D-Ox, Hydrolin, Reductone; sodium hydrosulfite, sodium sulfoxylate, Sulfoxylate; Vatrolite, Virtex L; Hydrosulfit, Prayon; Blankit, Albite A, Konite; Zepar, Burmol, Arostit
Identifiers
CAS Number	7775-14-6 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:66870 ;
ChemSpider	22897;
ECHA InfoCard	100.028.991
EC Number	231-890-0;
PubChem CID	24489;
RTECS number	JP2100000;
UNII	2K5B8F6ES1 ;
UN number	1384
CompTox Dashboard (EPA)	DTXSID9029697 ;
	InChI InChI=1S/2Na.H2O4S2/c;;1-5(2)6(3)4/h;;(H,1,2)(H,3,4)/q2*+1;/p-2 Key: JVBXVOWTABLYPX-UHFFFAOYSA-L;
	SMILES [O-]S(=O)S(=O)[O-].[Na+].[Na+];
Properties
Chemical formula	Na2S2O4
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
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H251, H302
Precautionary statements	P235+P410, P264, P270, P280, P301+P312, P330, P407, P413, P420, P501
NFPA 704 (fire diamond)	2 3 1
Flash point	100 °C (212 °F; 373 K)
Autoignition; temperature	200 °C (392 °F; 473 K)
Related compounds
Other anions	Sodium sulfite; Sodium sulfate
Related compounds	Sodium thiosulfate; Sodium bisulfite; Sodium metabisulfite; Sodium bisulfate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium dithionite (also known as sodium hydrosulfite) is a white crystalline powder with a sulfurous odor. Although it is stable in dry air, it decomposes in hot water and in acid solutions.

Names


Other names D-Ox, Hydrolin, Reductone sodium hydrosulfite, sodium sulfoxylate, Sulfoxylate Vatrolite, Virtex L Hydrosulfit, Prayon Blankit, Albite A, Konite Zepar, Burmol, Arostit
Identifiers
CAS Number	7775-14-6^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:66870^N
ChemSpider	22897
ECHA InfoCard	100.028.991
EC Number	231-890-0
PubChem CID	24489
RTECS number	JP2100000
UNII	2K5B8F6ES1^Y
UN number	1384
CompTox Dashboard (EPA)	DTXSID9029697
InChI InChI=1S/2Na.H2O4S2/c;;1-5(2)6(3)4/h;;(H,1,2)(H,3,4)/q2*+1;/p-2 Key: JVBXVOWTABLYPX-UHFFFAOYSA-L
SMILES [O-]S(=O)S(=O)[O-].[Na+].[Na+]
Properties
Chemical formula	Na₂S₂O₄
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
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H251, H302
Precautionary statements	P235+P410, P264, P270, P280, P301+P312, P330, P407, P413, P420, P501
NFPA 704 (fire diamond)	2 3 1
Flash point	100 °C (212 °F; 373 K)
Autoignition temperature	200 °C (392 °F; 473 K)
Related compounds
Other anions	Sodium sulfite Sodium sulfate
Related compounds	Sodium thiosulfate Sodium bisulfite Sodium metabisulfite Sodium bisulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references