1666. Calcium Dichromate(VI)

Nomenclature

CAS number: 14307-33-6
Calcium bichromate.
CaCr2O7; mol wt 256.07.
Ca 15.65%, Cr 40.61%, O 43.74%.

Description and references

Prepn: Hartford et al., J. Am. Chem. Soc. 72, 3353 (1950).

Derivative

Trihydrate.

Properties

Bipyramidal orange-red crystals. Nonhygroscopic if pure. Dec on heating above 100° to CaCrO4 and CrO3. d430 2.370. Very sol in water; insol in ether, CCl4, hydrocarbons; dissolves in alc with immediate reduction of the dichromate and pptn of brown hydrous chromic chromate; dissolves in acetone with subsequent pptn of CaCrO4.

Use

As catalyst; in manuf of CrCl3 and CrO3; corrosion inhibitor.