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Properties of substance:

disulfuric acid

Group of substances:

inorganic

Physical appearance:

colorless crystals

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

H2O7S2

Structural formula as text:

H2S2O7

Molar/atomic mass: 178.14

Melting point (°C):

35

Solubility (g/100 g of solvent):

ethanol: reaction [Ref.]
sulfur dioxide: miscible [Ref.]
sulfuric acid: miscible [Ref.]
water: reaction [Ref.]

Density:

1.9 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    B(OH)3 + 3H2S2O7 → H[B(HSO4)4] + 2H2SO4

Dissociation:

H0 (1) = -15 (25°C)
pKa (1) = 3.8 (25°C, acetic acid)

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

-1272.4 (s)

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

113 (s)

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

24.8

References:

  1. Holleman A.F., Wiberg E., Wiberg N. Lehrbuch der Anorganischen Chemie. - Berlin: Walter de Gruyter, 1995. - pp. 244
  2. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 204-205 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru