Magnesium chromate

Magnesium chromate

Identifiers
CAS Number	13423-61-5
ChemSpider	55507
Jmol 3D model	Interactive image
PubChem	61599
InChI InChI=1S/Cr.Mg.4O/q;+2;;;2*-1 Key: CRGGPIWCSGOBDN-UHFFFAOYSA-N InChI=1/Cr.Mg.4O/q;+2;;;2*-1/rCrO4.Mg/c2-1(3,4)5;/q-2;+2 Key: CRGGPIWCSGOBDN-OVNOGNLDAB
SMILES [O-][Cr](=O)(=O)[O-].[Mg+2]
Properties
Chemical formula	CrMgO4
Molar mass	140.30 g·mol−1
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Magnesium chromate is a chemical compound, with the formula MgCrO₄. It is a white or brownish, odorless, water-soluble solid with several important industrial uses. This chromate occurs naturally as a spinel, or can be manufactured as a powder.

History

Before 1940, the literature about Magnesium chromate and its hydrates was sparse, but studies starting in that year looked at its properties and solubility.

Uses

It is available commercially in a variety of powders, from nanoscale to micron-sized, either as an anhydrous or hydrated form.

As a hydrate, it is useful as a corrosion inhibitor and pigment, or as an ingredient in cosmetics. In 2011, an undecahydrate (containing 11 molecules of water) of this compound was discovered by scientists at the University College London.

Hazards

Magnesium chromate hydrate should be stored at room temperature, and there is no current therapeutic use. It is a suspected carcinogen, and can cause acute and dermititis, and possibly kidney and liver damage if inhaled, so it should be treated as a hazardous waste.