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
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.000.522 Edit this at Wikidata
EC Number
  • 200-573-9
UNII
  • 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
  • C(CN(CC(=O)[O-])CC(=O)[O-])N(CC(=O)[O-])CC(=O)[O-].O.[Na+].[Na+].[Na+].[Na+]
Properties
C10H12N2Na4O8
Molar mass 380.171 g·mol−1
Appearance White solid
Hazards
GHS labelling:
GHS05: CorrosiveGHS07: Exclamation mark
Danger
H302, H318
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).

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 EDTA4-. A 1% aqueous solution has a pH of approximately 11.3. When dissolved in neutral water, it converts partially to H2EDTA2-. Ethylenediaminetetraacetic acid is produced commercially via the intermediacy of tetrasodium EDTA.[1]

Ethylenediaminetetraacetic acid is the acidic form of tetrasodium EDTA.
  1. ^ Hart, J. Roger (2005). "Ethylenediaminetetraacetic Acid and Related Chelating Agents". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a10_095. ISBN 978-3527306732.