Erdmann's Salt
Structural Formula Vector Image
Title: Erdmann's Salt
CAS Registry Number: 13600-89-0
CAS Name: Ammonium diamminetetrakis(nitrito-N)cobaltate(1-)
Molecular Formula: CoH10N7O8
Molecular Weight: 295.05
Percent Composition: Co 19.97%, H 3.42%, N 33.23%, O 43.38%
Line Formula: NH4[Co(NH3)2(NO2)4]
Literature References: Prepared by evaporating a neutral aq soln of NH4NO2 and CoCl2: Erdmann, J. Prakt. Chem. 97, 410 (1866); Gibbs, Proc. Am. Acad. 10, 13 (1875); improved technique: J├Ârgensen, Z. Anorg. Chem. 17, 477 (1898). Prepn from CoCO3 and NH4NO2: Harkins et al., J. Am. Chem. Soc. 38, 2647 (1916).
Properties: Dark, reddish-brown, orthorhombic bipyramidal crystals. d420 1.972. Sol in water. A 1% aq soln is precipitated by AgNO3, Tl2SO4, CsCl, RbCl, cinchonine sulfate.
Density: d420 1.972
Status: This monograph has been retired and is no longer subject to revision or update.

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