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Properties of substance:

hyponitrous acid

Group of substances:

inorganic

Physical appearance:

colorless crystals

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

H2N2O2

Structural formula as text:

HON=NOH

Molar/atomic mass: 62.03

Decomposition temperature (°C):

25

Solubility (g/100 g of solvent):

diethyl ether: soluble [Ref.]
ethanol: very soluble [Ref.]
water: very soluble [Ref.]

Hygroscopic:

yes

Electrode potential:

2NO + 2H+ + 2e- → H2N2O2, E = 0.712 V (water, 25°C)
H2N2O2 + 2H+ + 2e- → N2 + 2H2O, E = 2.65 V (water, 25°C)

Dissociation:

pKa (1) = 7 (20°C, water)
pKa (2) = 11 (20°C, water)

Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

-47.31 (aqueous solution) [Ref.]

Standard molar Gibbs energy of formation ΔfG (298 K, kJ/mol)

46.05 (aqueous solution) [Ref.]

Standard molar entropy S (298 K, J/(mol·K))

217.7 (aqueous solution) [Ref.]

References:

  1. Journal of the Chemical Society, Dalton Transactions. - 2000. - No. 8. - pp. 1239-1242 [DOI: 10.1039/A909284F]
  2. Journal of the Chemical Society, Transactions. - 1899. - Vol. 75. - pp. 112-117 [DOI: 10.1039/CT8997500095]
  3. Quarterly Reviews, Chemical Society. - 1968. - Vol. 22, No. 1. - pp. 1 [DOI: 10.1039/QR9682200001]
  4. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 406, 428-430 [Russian]
  5. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 425 [Russian]
  6. Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 650-651 [Russian]
  7. Спицын В.И., Мартыненко Л.И. Неорганическая химия. - Ч.1. - М.: ИМУ, 1991. - pp. 130-131 [Russian]
  8. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 63 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru