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Properties of substance:

tellurous acid

Group of substances:

inorganic

Physical appearance:

white rhombic crystals

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

H2O3Te

Structural formula as text:

H2TeO3

Molar/atomic mass: 177.61

Decomposition temperature (°C):

40

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: 0.00067 (20°C) [Ref.]

Dissociation:

pKa (1) = 2.7 (25°C, water)
pKa (1) = 7.7 (25°C, water)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-613 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-318.8 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-93
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 104 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru