Rongalite

Rongalite
Names
	IUPAC name Sodium hydroxymethanesulfinate
	Other names Sodium formaldehydesulfoxylate, sodium oxymethylene sulfoxylate, Brüggolit
Identifiers
CAS Number	149-44-0 ; 6035-47-8 (dihydrate) ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL2107242 ;
ChemSpider	8649 ;
ECHA InfoCard	100.005.219
EC Number	205-739-4;
PubChem CID	23689980;
RTECS number	PB0380000;
UNII	X4ZGP7K714 ; SQ4705447D (dihydrate) ;
CompTox Dashboard (EPA)	DTXSID7027120 ;
	InChI InChI=1S/CH4O3S.Na/c2-1-5(3)4;/h2H,1H2,(H,3,4);/q;+1/p-1 Key: XWGJFPHUCFXLBL-UHFFFAOYSA-M ; InChI=1/CH4O3S.Na/c2-1-5(3)4;/h2H,1H2,(H,3,4);/q;+1/p-1 Key: XWGJFPHUCFXLBL-REWHXWOFAH;
	SMILES [Na+].[O-]S(=O)CO;
Properties
Chemical formula	CH3NaO3S
Molar mass	118.10 g/mol; 154.14 g/mol, dihydrate
Appearance	colorless crystals
Density	1.75 g/cm3, dihydrate
Melting point	64.5 °C (148.1 °F; 337.6 K) dihydrate
Solubility in water	600 g/L, dihydrate (approximate)
Acidity (pKa)	decomposes at low pH
Structure
Molecular shape	pyramidal at S
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H341
Precautionary statements	P201, P202, P281, P308+P313, P405, P501
Related compounds
Related compounds	SO32−, CH2O
	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

Rongalite is a chemical compound with the molecular formula Na⁺HOCH₂SO₂⁻. This salt has many additional names, including Rongalit, sodium hydroxymethylsulfinate, sodium formaldehyde sulfoxylate, and Bruggolite. It is listed in the European Cosmetics Directive as sodium oxymethylene sulfoxylate (INCI). It is water-soluble and generally sold as the dihydrate. The compound and its derivatives are widely used in the dye industry. The structure of this salt has been confirmed by X-ray crystallography.

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