Ethylenediaminetetraacetic acid

Ethylenediaminetetraacetic acid
Names
	IUPAC name 2,2',2'',2'''-(ethane-1,2-diyldinitrilo)tetraacetic acid
	Other names EDTA, Y, H4EDTA, Diaminoethanetetraacetic acid, Edetic acid, Edetate, Ethylenedinitrilotetraacetic acid, Versene, Ethylene diamine tetraacetic acid, ethylenediaminetetraacetate, 2-[2-(Bis(carboxymethyl)amino) ethyl-(carboxymethyl)amino]acetic acid
Identifiers
CAS Number	60-00-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	5826;
ECHA InfoCard	100.000.409
PubChem CID	6049;
RTECS number	AH4025000;
CompTox Dashboard (EPA)	DTXSID6022977 ;
	SMILES OC(CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O)=O;
Properties
Chemical formula	C10H16N2O8
Molar mass	292.24
Density	0.86 g/cm3
Melting point	237–245 °C (dec.)
Acidity (pKa)	pK1=0.0 (CO2H) (µ=1.0); pK2=1.5 (CO2H) (µ=0.1); pK3=2.00 (CO2H) (µ=0.1); pK4=2.69 (CO2H) (µ=0.1); pK5=6.13 (NH+) (µ=0.1); pK6=10.37 (NH+) (µ=0.1)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	irritant
NFPA 704 (fire diamond)	1 0
	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

EDTA is a widely used initialism for the chemical compound ethylenediaminetetraacetic acid (which has many other names, see Table). EDTA is a polyamino carboxylic acid with the formula [CH₂N(CH₂CO₂H)₂]₂. This colourless, water-soluble solid is widely used to dissolve scale. Its usefulness arises because of its role as a chelating agent, i.e. its ability to "sequester" metal ions such as Ca²⁺ and Fe³⁺. After being bound by EDTA, metal ions remain in solution but exhibit diminished reactivity. EDTA is produced as several salts, notably disodium EDTA and calcium disodium EDTA.

No I did

...

Notes & References

^ Harris, D.C. "Quantitative Chemical Analysis", 7^th ed., W. H. Freeman and Compagny, New York, 2007

...

[1] Harris, D.C. "Quantitative Chemical Analysis", 7^th ed., W. H. Freeman and Compagny, New York, 2007

[1]