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Properties of substance:

ammonium chromic sulfate dodecahydrate

Synonyms:

ammonium chrome alums

Group of substances:

inorganic

Physical appearance:

green cubic crystals

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

H28CrNO20S2

Structural formula as text:

NH4Cr(SO4)2 * 12H2O

Molar/atomic mass: 478.33

Melting point (°C):

94

Solubility (g/100 g of solvent):

ethanol: soluble [Ref.]
water: 2.1 (0°C) [Ref.]
water: 15.7 (40°C) [Ref.]

Density:

1.72 (20°C, g/cm3)

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

-11346 (s)

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

-9349 (s)

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

1423 (s)

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

1407 (s)

LD50 (mg/kg):

720 (rats, oral)

References:

  1. Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 11ed. - Wiley-interscience, 2004. - pp. 232
  2. Perry D.L. Handbook of Inorganic Compounds. - 2nd ed. - CRC Press, 2011. - pp. 20
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 110 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru