Potassium carbonate

Potassium carbonate
Names
	IUPAC name Potassium carbonate
	Other names Carbonate of potash, dipotassium carbonate, sub-carbonate of potash, pearl ash, pearlash, potash, salt of tartar, salt of wormwood.
Identifiers
CAS Number	584-08-7 ; 6381-79-9 sesquihydrate ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:131526 ;
ChemSpider	10949 ;
ECHA InfoCard	100.008.665
E number	E501(i) (acidity regulators, ...)
PubChem CID	11430;
RTECS number	TS7750000;
UNII	BQN1B9B9HA ; L9300DKS8U (sesquihydrate) ;
CompTox Dashboard (EPA)	DTXSID2036245 ;
	InChI InChI=1S/CH2O3.2K/c2-1(3)4;;/h(H2,2,3,4);;/q;2+1/p-2 Key: BWHMMNNQKKPAPP-UHFFFAOYSA-L ; InChI=1/CH2O3.2K/c2-1(3)4;;/h(H2,2,3,4);;/q;2+1/p-2 Key: BWHMMNNQKKPAPP-NUQVWONBAS;
	SMILES C(=O)([O-])[O-].[K+].[K+];
Properties
Chemical formula	K2CO3
Molar mass	138.205 g·mol−1
Appearance	White, hygroscopic solid
Density	2.43 g/cm3
Melting point	891 °C (1,636 °F; 1,164 K)
Boiling point	Decomposes
Solubility in water	110.3 g/(100 mL) (20 °C) ; 149.2 g/(100 mL) (100 °C)
Solubility	3.11 g/(100 mL) (25 °C) methanol; Insoluble in alcohol, acetone;
Acidity (pKa)	10.25
Magnetic susceptibility (χ)	−59.0·10−6 cm3/mol
Thermochemistry
Heat capacity (C)	114.4 J/(mol·K)
Std molar; entropy (S⦵298)	155.5 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−1151.0 kJ/mol
Gibbs free energy (ΔfG⦵)	−1063.5 kJ/mol
Enthalpy of fusion (ΔfH⦵fus)	27.6 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H315, H319, H335
Precautionary statements	P261, P305+P351+P338
NFPA 704 (fire diamond)	2 0 0
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	1870 mg/kg (oral, rat)
Safety data sheet (SDS)	ICSC 1588
Related compounds
Other anions	Potassium bicarbonate; Potassium sulfate; Potassium chromate;
Other cations	Lithium carbonate; Sodium carbonate; Rubidium carbonate; Caesium carbonate;
Related compounds	Ammonium carbonate; Calcium carbonate;
	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

Potassium carbonate is the inorganic compound with the formula K₂C O₃. It is a white salt, which is soluble in water and forms a strongly alkaline solution. It is deliquescent, often appearing as a damp or wet solid. Potassium carbonate is mainly used in the production of soap and glass. Commonly, it can be found as the result of leakage of alkaline batteries. Potassium carbonate is a potassium salt of carbonic acid. This salt consists of potassium cations K⁺ and carbonate anions CO2−3, and is therefore an alkali metal carbonate.