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Properties of substance:

EDTA

Synonyms:

ethylenediaminetetraacetic acid
ethylenediamine-N,N,N',N'-tetraacetic acid

Group of substances:

organic

Physical appearance:

white crystals

Empirical formula (Hill's system for organic substances):

C10H16N2O8

Structural formula as text:

(HOOCCH2)2NCH2CH2N(CH2COOH)2

Molar/atomic mass: 292.24

Melting point (°C):

250

Decomposition temperature (°C):

250

Solubility (g/100 g of solvent):

acetone: slightly soluble [Ref.]
benzene: slightly soluble [Ref.]
diethyl ether: slightly soluble [Ref.]
dimethylformamide: soluble (153°C) [Ref.]
ethanol: slightly soluble [Ref.]
water: 0.0283 (20°C) [Ref.]
water: 0.0337 (25°C) [Ref.]
water: 0.0401 (30°C) [Ref.]
water: 0.0485 (35°C) [Ref.]
water: 0.0582 (40°C) [Ref.]
water: 0.0687 (45°C) [Ref.]
water: 0.938 (100°C) [Ref.]

Hygroscopic:

no

Dissociation:

pKBH+ (1) = 1.5 (25°C, water)
pKBH+ (2) = 0 (25°C, water)
pKa (1) = 1.99 (20°C, water)
pKa (2) = 2.67 (20°C, water)
pKa (3) = 6.16 (20°C, water)
pKa (4) = 10.26 (20°C, water)

LD50 (mg/kg):

30 (mice, oral)
28.5 (mice, intravenous)

References:

  1. Armarego W. L. F. Purification of Laboratory Chemicals. - 5ed. - 2003. - pp. 237
  2. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 3-256
  3. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 1.217
  4. Inorganic Chemistry. - 1991. - Vol. 30, No. 12. - pp. 2638-2642
  5. Kleemann A. Pharmaceutical Substances. - 2000. - pp. 729-731
  6. Дятлова Н.М., Темкина В.Я., Попов К.И. Комплексоны и комплексонаты металлов. - М.: Химия, 1988. - pp. 122-123 [Russian]
  7. Пршибил Р. Аналитические применения этилендиаминтетрауксусной кислоты и родственных соединений. - М.: Мир, 1975 [Russian]
  8. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 498 [Russian]
  9. Юрист И.М., Талмуд М.М. Селективное комплексонометрическое титрование. - М.: Наука, 1993. - pp. 14-16 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru