Calcium chromate

Calcium chromate is an inorganic compound with the formula CaCrO4, i.e. the chromate salt of calcium. It is a bright yellow solid which is normally found in the dihydrate form CaCrO4·2H2O. A very rare anhydrous mineral form exists in nature, which is known as chromatite.

Calcium Chromate

Anhydrous calcium chromate

Calcium chromate pigment
Names
IUPAC name
Calcium chromate
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
UNII
  • InChI=1S/Ca.Cr.4O/q+2;;;;2*-1 Y
    Key: RFAFBXGYHBOUMV-UHFFFAOYSA-N Y
  • InChI=1/Ca.Cr.4O/q+2;;;;2*-1/rCa.CrO4/c;2-1(3,4)5/q+2;-2
    Key: RFAFBXGYHBOUMV-DETYUTSMAY
  • [Ca+2].[O-][Cr]([O-])(=O)=O
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
Occupational safety and health (OHS/OSH):
Main hazards
 highly toxic, carcinogen, mutagen
NFPA 704 (fire diamond)
3
0
1
OX
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

The compound is occasionally used as a pigment, but this usage is limited due to the very toxic and carcinogenic nature of hexavalent chromium compounds such as chromate salts.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.