Tetrasodium EDTA

Tetrasodium EDTA

Names
IUPAC name Tetrasodium N,N′-(ethane-1,2-diyl)bis[N-(carboxylatomethyl)glycinate]
Systematic IUPAC name Tetrasodium 2,2′,2′′,2′′′-(Ethane-1,2-diyldinitrilo)tetraacetate
Other names E39 Trilon B
Identifiers
CAS Number	64-02-8 (anhydrous) Y 13235-36-4 (tetrahydrate) Y
3D model (JSmol)	Interactive image
ChemSpider	5914
ECHA InfoCard	100.000.522
EC Number	200-573-9
PubChem CID	6144
UNII	MP1J8420LU (anhydrous) Y L13NHD21X6 (tetrahydrate) Y
CompTox Dashboard (EPA)	DTXSID3026350
InChI InChI=1S/C10H16N2O8.4Na.H2O/c13-7(14)3-11(4-8(15)16)1-2-12(5-9(17)18)6-10(19)20;;;;;/h1-6H2,(H,13,14)(H,15,16)(H,17,18)(H,19,20);;;;;1H2/q;4*+1;/p-4 Key: GXFFSKMBMYHTAE-UHFFFAOYSA-J
SMILES C(CN(CC(=O)[O-])CC(=O)[O-])N(CC(=O)[O-])CC(=O)[O-].O.[Na+].[Na+].[Na+].[Na+]
Properties
Chemical formula	C10H12N2Na4O8
Molar mass	380.171 g·mol−1
Appearance	White solid
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H318
Precautionary statements	P264, P270, P280, P301+P312, P305+P351+P338, P310, P330, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tetrasodium EDTA is the salt resulting from the neutralization of ethylenediaminetetraacetic acid with four equivalents of sodium hydroxide (or an equivalent sodium base). It is a white solid that is highly soluble in water. Commercial samples are often hydrated, e.g. Na₄EDTA^.4H₂O. The properties of solutions produced from the anhydrous and hydrated forms are the same, provided they are at the same pH.

It is used as a source of the chelating agent EDTA^4-. A 1% aqueous solution has a pH of approximately 11.3. When dissolved in neutral water, it converts partially to H₂EDTA^2-. Ethylenediaminetetraacetic acid is produced commercially via the intermediacy of tetrasodium EDTA.^[1]

Products

The substance is also known as Dissolvine E-39. It is a salt of edetic acid. It has been known at least since 1954.^[2][3] It is sometimes used as a chelating agent.^[4][5][6][7]

The assignee on 5% of patents at the USPTO containing the substance is the firm Procter and Gamble. It is used most notably in cosmetics and hair and skin care products.

The substance has been used to aid in formulation of a removal product for rust, corrosion, and scale from ferrous metal, copper, brass, and other surfaces.^[8]

At a concentration of 6%, it is the main active ingredient in some types of engine coolant system flushes.^[9]

References