Calcium Chromate(VI)
Title: Calcium Chromate(VI)
CAS Registry Number: 13765-19-0
Additional Names: Calcium chrome yellow; gelbin; yellow ultramarine; C.I. 77223; C.I. Pigment Yellow 33
Molecular Formula: CaCrO4
Molecular Weight: 156.07
Percent Composition: Ca 25.68%, Cr 33.32%, O 41.01%
Literature References: Prepn: Mylius, Wrochem, Ber. 33, 3689 (1900); Udy, US 2493789; US 2494215 (both 1950); Dunn, O'Brien, US 2745764/5 (both 1956 to Vanadium Corp. of America).
Properties: Yellow monoclinic or rhombic crystals. Sparingly sol in water; sol in dil acids; practically insol in alcohol. Also occurs as hemihydrate, monohydrate, and dihydrate.
CAUTION: Chromium hexavalent compounds are listed as known human carcinogens: Report on Carcinogens, Eleventh Edition (PB2005-104914, 2004) p III-63.
Use: As a pigment, corrosion inhibitor; manuf of chromium; in oxidizing reactions; in battery depolarization.

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