Main page (Russian) Search in database (English)
Sitemap (Russian)

New version database

Properties of substance:

selenic acid

Group of substances:

inorganic

Physical appearance:

colorless hexagonal crystals

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

H2O4Se

Structural formula as text:

H2SeO4

Molar/atomic mass: 144.97

Melting point (°C):

62

Decomposition temperature (°C):

260

Solubility (g/100 g of solvent):

ammonia liquid : insoluble [Ref.]
sulfuric acid: soluble [Ref.]
water: 566 (20°C) [Ref.]
water: 1720 (40°C) [Ref.]
water: miscible (60°C) [Ref.]

Properties of solutions:

49,4% (wt.), solvent - water
  Freezing point (°C) = -83.4
80% (wt.), solvent - water
  Density (g/cm3) = 2.122 (20°)

Hygroscopic:

yes

Density:

2.95 (15°C, g/cm3)

    Electrode potential:

    SeO42- + 4H+ + 2e- → H2SeO3 + H2O, E = 1.15 V (water, °C)

    Dissociation:

    pKa (1) = -3 (25°C, water)
    pKa (2) = 1.9 (25°C, water)

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

    -532.6 (s)

    References:

    1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 601
    2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 190-191 [Russian]
    3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 362 [Russian]
    4. Редкие и рассеянные элементы. Химия и технология. - Кн. 3. - М.: Мисис, 2003. - pp. 244-246 [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]
      What information do you need?




      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru