Bicarbonate

Bicarbonate
	Skeletal formula of bicarbonate with the explicit hydrogen added
	Ball and stick model of bicarbonate
Names
	IUPAC name Hydrogencarbonate
	Systematic IUPAC name Hydroxidodioxidocarbonate(1−)
	Other names Hydrogen carbonate; Hydrocarbonate;
Identifiers
CAS Number	71-52-3 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	3903504
ChEBI	CHEBI:17544 ;
ChEMBL	ChEMBL363707 ;
ChemSpider	749 ;
Gmelin Reference	49249
KEGG	C00288 ;
PubChem CID	769;
UNII	HN1ZRA3Q20 ;
CompTox Dashboard (EPA)	DTXSID2049921 ;
	InChI InChI=1S/CH2O3/c2-1(3)4/h(H2,2,3,4)/p-1 Key: BVKZGUZCCUSVTD-UHFFFAOYSA-M ;
	SMILES OC([O-])=O;
Properties
Chemical formula	HCO3−
Molar mass	61.0168 g mol−1
log P	−0.82
Acidity (pKa)	10.3
Basicity (pKb)	7.7
Conjugate acid	Carbonic acid
Conjugate base	Carbonate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

In inorganic chemistry, bicarbonate (American English: /baɪˈkɑːr.bə.neɪt/ ^ⓘ; IUPAC-recommended nomenclature: hydrogencarbonate) is an intermediate form in the deprotonation of carbonic acid. It is a polyatomic anion with the chemical formula H C O₃^–.

Bicarbonate serves a crucial biochemical role in the physiological pH buffering system.

The term "bicarbonate" was coined in 1814 by the English chemist William Hyde Wollaston. In his original use the bi- referred to the presence of two carbonic acid derivatives in carbonates made by reaction with a base. Despite its modern use in reference to a molecule with only one carbon atom it lives on as a trivial name.