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Properties of substance:

metasilicic acid

Group of substances:

inorganic

Physical appearance:

white amorphous substance

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

H2O3Si

Structural formula as text:

H2SiO3

Molar/atomic mass: 78.1

Solubility (g/100 g of solvent):

water: insoluble [Ref.]

Density:

3.17 (20°C, g/cm3)

Dissociation:

pKa (1) = 9.66 (18°C, water)
pKa (2) = 11.8 (18°C, water)

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

-1188.7 (s)

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

-1092.4 (s)

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

134 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-13
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 75 [Russian]
  3. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 507 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru