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

Properties of substance:

phosphinic acid

Group of substances:

inorganic

Physical appearance:

colorless crystals

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

H3O2P

Structural formula as text:

H3PO2

Molar/atomic mass: 65.996

Melting point (°C):

26.5

Decomposition temperature (°C):

50

Solubility (g/100 g of solvent):

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

Hygroscopic:

yes

Density:

1.49 (19°C, g/cm3)

    Electrode potential:

    HPO32- + 2H2O + 2e- → H2PO2- + 3OH-, E = -1.57 V (water, 25°C)

    Dissociation:

    pKa (1) = 1.1 (25°C, water)

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

    -614.6 (s)

    Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

    9.6

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

    -595.4 (l)

    References:

    1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-13
    2. Альберт А., Сержент Е. Константы ионизации кислот и оснований. - М.-Л.: Химия, 1964. - pp. 145 [Russian]
    3. Везер В. Фосфор и его соединения. - М.: ИИЛ, 1962. - pp. 282-290 [Russian]
    4. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 476-479 [Russian]
    5. Краткая химическая энциклопедия. - Т. 5: Т-Я. - М.: Советская энциклопедия, 1967. - pp. 514 [Russian]
    6. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 445 [Russian]
    7. Постников Н.Н. Термическая фосфорная кислота. Химия и технология. - М.: Химия, 1970. - pp. 50 [Russian]
    8. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 109 [Russian]
    9. Успехи химии. - 1975. - Т.44, №12. - pp. 2150-2151 [Russian]
    10. Успехи химии. - 1980. - Т.49, №1. - pp. 93-110 [Russian]
      What information do you need?



      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru