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Properties of substance:

isothiocyanic acid

Group of substances:

inorganic

Physical appearance:

yellowish liquid

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

CHNS

Structural formula as text:

HNCS

Molar/atomic mass: 59.09

Melting point (°C):

-110

Decomposition temperature (°C):

-90

Solubility (g/100 g of solvent):

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

Reactions:

  1. [Ref.1]
    Fe + 2HSCN + 3H2O → Fe(SCN)2 * 3H2O + H2

Dissociation:

pKa (1) = 0.85 (18°C, water)

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

104.6 (g)

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

247.36 (g)

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

48.16 (g)

References:

  1. Губен И. Методы органической химии. - Т. 4, Вып. 1. - М.-Л.: ГНТИХЛ, 1949. - pp. 89 [Russian]
  2. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 526-527 [Russian]
  3. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 586-587 [Russian]
  4. Химия псевдогалогенидов. - Под ред. Голуба А.М., Кёлера Х., Скопенко В.В. - Киев: Вища школа, 1981. - pp. 162-163 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru