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 Y
3D model (Jmol)	Interactive image
ChemSpider	24471 Y
ECHA InfoCard	100.033.955
EC Number	237-66-8
PubChem	26264
RTECS number	GB2750000
InChI 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
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
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 (CaCrO₄) is a bright yellow solid. It normally occurs as the dihydrate.

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.^[1]

Uses

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

References