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Properties of substance:

orthosilicic acid

Group of substances:

inorganic

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

H4O4Si

Structural formula as text:

H4SiO4

Molar/atomic mass: 96.115

Dissociation:

pKa (1) = 9.7 (25°C, water)
pKa (2) = 11.7 (30°C, water)
pKa (3) = 12 (30°C, water)
pKa (4) = 12 (30°C, water)

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

-1481.1 (s)

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

-1332.9 (s)

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

192 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-14
  2. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 55 [Russian]
  3. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 79 [Russian]
  4. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 507 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru