Sodium acetate

Sodium acetate
Names
	Preferred IUPAC name Sodium acetate
	Systematic IUPAC name Sodium ethanoate
	Other names Hot ice (sodium acetate trihydrate)
Identifiers
CAS Number	anhydrous: 127-09-3 ; trihydrate: 6131-90-4 ;
3D model (JSmol)	anhydrous: Interactive image;
Beilstein Reference	3595639
ChEBI	anhydrous: CHEBI:32954 ; trihydrate: CHEBI:32138;
ChEMBL	anhydrous: ChEMBL1354 ;
ChemSpider	anhydrous: 29105 ;
DrugBank	anhydrous: DB09395;
ECHA InfoCard	100.004.386
EC Number	anhydrous: 204-823-8;
E number	E262 (preservatives)
Gmelin Reference	20502
KEGG	trihydrate: D01779;
PubChem CID	anhydrous: 517045; trihydrate: 23665404;
RTECS number	anhydrous: AJ4300010 (anhydrous); AJ4580000;
UNII	anhydrous: NVG71ZZ7P0 ; trihydrate: 4550K0SC9B ;
CompTox Dashboard (EPA)	anhydrous: DTXSID2027044 ;
	InChI InChI=1S/C2H4O2.Na/c1-2(3)4;/h1H3,(H,3,4);/q;+1/p-1 Key: VMHLLURERBWHNL-UHFFFAOYSA-M ; anhydrous: InChI=1/C2H4O2.Na/c1-2(3)4;/h1H3,(H,3,4);/q;+1/p-1 Key: VMHLLURERBWHNL-REWHXWOFAT;
	SMILES anhydrous: [Na+].[O-]C(=O)C;
Properties
Chemical formula	C2H3NaO2
Molar mass	82.034 g·mol−1
Appearance	White deliquescent powder or crystals
Odor	Vinegar (acetic acid) odor when heated to decomposition
Density	1.528 g/cm3 (20 °C, anhydrous); 1.45 g/cm3 (20 °C, trihydrate)
Melting point	324 °C (615 °F; 597 K) ; (anhydrous); 58 °C (136 °F; 331 K); (trihydrate)
Boiling point	881.4 °C (1,618.5 °F; 1,154.5 K) ; (anhydrous); 122 °C (252 °F; 395 K); (trihydrate) decomposes
Solubility in water	Anhydrous:; 119 g/100 mL (0 °C); 123.3 g/100 mL (20 °C); 125.5 g/100 mL (30 °C); 137.2 g/100 mL (60 °C); 162.9 g/100 mL (100 °C); Trihydrate:; 32.9 g/100 mL (-10 °C); 36.2 g/100 mL (0 °C); 46.4 g/100 mL (20 °C); 82 g/100 mL (50 °C)
Solubility	Soluble in alcohol, hydrazine, SO2
Solubility in methanol	16 g/100 g (15 °C); 16.55 g/100 g (67.7 °C)
Solubility in ethanol	Trihydrate:; 5.3 g/100 mL
Solubility in acetone	0.5 g/kg (15 °C)
Acidity (pKa)	24 (20 °C); 4.75 (when mixed with CH3COOH as a buffer)
Basicity (pKb)	9.25
Magnetic susceptibility (χ)	−37.6·10−6 cm3/mol
Refractive index (nD)	1.464
Structure
Crystal structure	Monoclinic
Thermochemistry
Heat capacity (C)	100.83 J/(mol·K) (anhydrous); 229 J/(mol·K) (trihydrate)
Std molar; entropy (S⦵298)	138.1 J/(mol·K) (anhydrous); 262 J/(mol·K) (trihydrate)
Std enthalpy of; formation (ΔfH⦵298)	−709.32 kJ/mol (anhydrous); −1604 kJ/mol (trihydrate)
Gibbs free energy (ΔfG⦵)	−607.7 kJ/mol (anhydrous)
Pharmacology
ATC code	B05XA08 (WHO)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Irritant
NFPA 704 (fire diamond)	0 1 1
Flash point	>250 °C (482 °F; 523 K)
Autoignition; temperature	607 °C (1,125 °F; 880 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	3530 mg/kg (oral, rat); >10000 mg/kg (rabbit, dermal)
LC50 (median concentration)	>30 g/m3 (rat, 1 h)
Safety data sheet (SDS)	Fisher Scientific
Related compounds
Other anions	Sodium formate; Sodium propionate
Other cations	Potassium acetate; Calcium acetate
Related compounds	Sodium diacetate
	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 acetate, CH₃COONa, also abbreviated Na O Ac, is the sodium salt of acetic acid. This salt is colorless, deliquescent, and hygroscopic.