Title: Chromic Hydroxide
CAS Registry Number: 1308-14-1
CAS Name: Chromium hydroxide
Additional Names: chromic oxide gel; chromic oxide, hydrous
Molecular Formula: CrH3O3
Molecular Weight: 103.02
Percent Composition: Cr 50.47%, H 2.94%, O 46.59%
Line Formula: Cr(OH)3
Literature References: Occurs only as hydrates. Prepn: Ruthroff, Inorg. Synth. 2, 190 (1946); Hein, Herzog in Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) pp 1345-1346.
Derivative Type: Trihydrate
Molecular Formula: Cr(OH)3.3H2O
Molecular Weight: 157.06
Percent Composition: Cr 33.11%, O 61.12%, H 5.78%
Properties: Or Cr2O3.9H2O, blue-green powder. Practically insol in water. Sol in dil mineral acids when freshly prepd, giving blue or green soln; becomes insol in acids on aging. Cr(OH)3.nH2O, shining, vitrous, jet-black particles. Useful as catalyst in dehydrogenation of alcohols and paraffins, hydrogenation of olefins.
Use: As pigment; in tanning industry; as mordant; as catalyst for organic reactions. |