Calcium chromate

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
CAS Number	13765-19-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	24471 ;
ECHA InfoCard	100.033.955
EC Number	237-66-8;
PubChem CID	26264;
RTECS number	GB2750000;
UNII	J1FGH4ZJ4M ;
CompTox Dashboard (EPA)	DTXSID0024717 ;
	InChI InChI=1S/Ca.Cr.4O/q+2;;;;2-1 Key: RFAFBXGYHBOUMV-UHFFFAOYSA-N ; InChI=1/Ca.Cr.4O/q+2;;;;2-1/rCa.CrO4/c;2-1(3,4)5/q+2;-2 Key: RFAFBXGYHBOUMV-DETYUTSMAY;
	SMILES [Ca+2].[O-][Cr]([O-])(=O)=O;
Properties
Chemical formula	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)
Solubility in water	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
Crystal 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)	0 3 1 OX
	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

Calcium chromate (Ca Cr O₄) 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.

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

http://www.mindat.org
Occupational Safety And Health Guideline For Calcium Chromate Archived August 8, 2007, at the Wayback Machine

[1] ttp://www.mindat.org

[2] Occupational Safety And Health Guideline For Calcium Chromate Archived August 8, 2007, at the Wayback Machine