Magnesium chromate

Magnesium chromate is a chemical compound, with the formula MgCrO4. It is a yellow, odorless, water-soluble salt with several important industrial uses. This chromate can be manufactured as a powder.

Magnesium chromate
Names
Other names
Magnesium chromate(VI)
Magnesium monochromate
Magnesium monochromate(VI)
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.204
  • 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
  • [O-][Cr](=O)(=O)[O-].[Mg+2]
Properties
MgCrO4
Molar mass 140.297 g·mol−1
Appearance Yellow solid
soluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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.[1]

Uses

It is available commercially in a variety of powders, from nanoscale to micron-sized, either as an anhydrous or hydrated form.[2][3]

As a hydrate, it is useful as a corrosion inhibitor and pigment,[4] or as an ingredient in cosmetics.[5] In 2011, an undecahydrate (containing 11 molecules of water) of this compound was discovered by scientists at the University College London.[6]

Hazards

Magnesium chromate hydrate should be stored at room temperature, and there is no current therapeutic use.[7] It is a confirmed carcinogen, and can cause acute dermititis, and possibly kidney and liver damage if inhaled, so it should be treated as a hazardous waste.[8]

References
  1. Hill, Arthur E.; Soth, Glenn C.; Ricci, John E. (1940). "The Systems Magnesium Chromate—Water and Ammonium Chromate—Water from 0 to 75 °C". Journal of the American Chemical Society. 62 (8): 2131. doi:10.1021/ja01865a059.
  2. "Magnesium Chromate". American Elements. Archived from the original on 2013-07-22. Retrieved 2013-07-16.
  3. Li, Su Ping; Jia, Xiao Lin; Qi, Ya Fang (2011). "Synthesis of Nano-Crystalline Magnesium Chromate Spinel by Citrate Sol-Gel Method". Advanced Materials Research. 284–286: 730. doi:10.4028/www.scientific.net/AMR.284-286.730. S2CID 137408833.
  4. "Magnesium chromate hydrate, 99.8% (metals basis)". Us.vwr.com. Retrieved 2013-07-16.
  5. "Item # MG-401, Heavy Magnesium Chromate Powder On Atlantic Equipment Engineers, A Division Of Micron Metals, Inc". Metal-powders-compounds.micronmetals.com. Retrieved 2013-07-16.
  6. Fortes, A. Dominic; Wood, Ian G. (March 2012). "X-ray powder diffraction analysis of a new magnesium chromate hydrate, MgCrO4·11H2O". Powder Diffraction. 27 (1): 8–11. Bibcode:2012PDiff..27....8F. doi:10.1017/S088571561200005X. S2CID 101802113.
  7. "Magnesium chromate hydrate | CAS 23371-94-0 | Santa Cruz Biotech". Santa Cruz Biotechnology, Inc. Retrieved 2013-07-16.
  8. "Material Data Sheet" (PDF). McGean-Rohco, Inc. Archived from the original (PDF) on 2013-07-09. Retrieved 2013-07-16.
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