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Properties of substance:

calcium sulfite dihydrate

Group of substances:

inorganic

Physical appearance:

colorless hexagonal crystals

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

H4CaSO5

Structural formula as text:

CaSO3 * 2H2O

Molar/atomic mass: 156.17

Decomposition temperature (°C):

100

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
ammonia liquid : insoluble [Ref.]
ethyl acetate: insoluble [Ref.]
glycerol: 5.17 (15°C) [Ref.]
methyl acetate: insoluble [Ref.]
water: 0.0043 (18°C) [Ref.]
water: 0.0008 (100°C) [Ref.]

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

-1753 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

184 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

178.7 (s)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 327
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 138-139 [Russian]
  3. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 249 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru