Calcium chromate

Calcium chromate (CaCrO4) is a bright yellow solid. It normally occurs as the dihydrate, although the very rarely natural (mineral) form, known as chromatite, is anhydrous.[1] Very toxic.

Calcium Chromate

Calcium chromate

Calcium chromate dihydrate
Names
IUPAC name
Calcium dioxido-dioxo-chromium
Other names
Calcium chromate (VI)
Calcium monochromate
Calcium Chrome Yellow
C. I. Pigment Yellow 33
Gelbin
Yellow Ultramarine
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.955
EC Number
  • 237-66-8
RTECS number
  • GB2750000
Properties
CaCrO4
Molar mass 156.072 g/mol
Appearance bright yellow powder
Density 3.12 g/cm3
Melting point 2,710 °C (4,910 °F; 2,980 K)
anhydrous
4.5 g/100 mL (0 °C)
2.25 g/100 mL (20 °C)
dihydrate
16.3 g/100mL (20 °C)
18.2 g/100mL (40 °C)
Solubility soluble in acid
practically insoluble in alcohol
Structure
monoclinic
Related compounds
Other anions
calcium dichromate
Other cations
Beryllium chromate
Magnesium chromate
Strontium chromate
Barium chromate
Radium chromate
Hazards
Main hazards highly toxic, carcinogen, mutagen
NFPA 704 (fire diamond)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Properties

Calcium chromate loses water at 200 °C. It reacts with organic matter or reducing agents to form chromium(III). The solid will react explosively with hydrazine. If mixed with boron and ignited, calcium chromate will burn violently.[2]

Uses

It is used as a pigment, a corrosion inhibitor, and in electroplating, photochemical processing, and industrial waste treatment.

References

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