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Properties of substance:

selenious acid

Group of substances:

inorganic

Physical appearance:

colorless hexagonal crystals

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

H2O3Se

Structural formula as text:

H2SeO3

Molar/atomic mass: 128.97

Decomposition temperature (°C):

70

Solubility (g/100 g of solvent):

ammonia liquid : insoluble [Ref.]
ethanol: very soluble [Ref.]
water: 167 (20°C) [Ref.]
water: 385 (90°C) [Ref.]

Density:

3.004 (15°C, g/cm3)

Reactions:

  1. [Ref.1, Ref.2]
    H2SeO3 + 2SO2 + H2O → Se + 2H2SO4

Electrode potential:

H2SeO3 + 4H+ + 4e- → Se + 3H2O, E = 0.741 V (water, 25°C)

Dissociation:

pKa (1) = 2.46 (25°C, water)
pKa (2) = 7.3 (25°C, water)

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

-525 (s)

LD50 (mg/kg):

11 (mice, intravenous)

References:

  1. Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 12ed., Vol. 1-5. - Wiley, 2012. - pp. 3940-3941
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 601
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 360 [Russian]
  4. Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 801-802 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 342 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 200-201 [Russian]
  7. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 79 [Russian]
  8. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 520 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru