2226. Chromic Nitrate

Nomenclature

CAS number: 13548-38-4
Nitric acid chromium(3+) salt; chromium(III) nitrate.
CrN3O9; mol wt 238.01.
Cr 21.85%, N 17.65%, O 60.50%.
Cr(NO3)3.

Description and references

Prepn of anhydr salt from N2O5 and Cr(CO)6: Addison, Chapma, J. Chem. Soc. 1964, 539. Prepn of nonahydrate from Cr(OH)3 and dil HNO3 or by reducing CrO3 in the presence of HNO3: ACS Monograph Series no. 132, entitled “Chromium,” vol. 1, M. J. Udy, Ed. (Reinhold, New York, 1956) pp 203-204. Toxicity study: Smyth et al., Am. Ind. Hyg. Assoc. J. 30, 470 (1969).

Properties

Pale green, extremely deliquesc powder. Non-volatile. Dec above 60°. Sol in water, ethyl acetate, DMSO. Practically insol in benzene, CCl4, CHCl3. Reacts with ether, sometimes vigorously.

Derivative

Nonahydrate.

Properties

Deep violet, rhombic, monoclinic crystals. mp about 60°; dec above 100°. Sol in water, alcohol. Aq soln slowly becomes green on heating and rapidly recovers the reddish-violet color on cooling. LD50 orally in rats: 3.25 g/kg (Smyth).

Use

Prepn of Cr catalyst; in textile printing; corrosion inhibitor.