Magnesium perchlorate

Magnesium perchlorate
Magnesium perchlorate
CAS number 10034-81-8 YesY
PubChem 24840
ChemSpider 23223 YesY
RTECS number SC8925000
Jmol-3D images Image 1
Molecular formula Mg(ClO4)2
Molar mass 223.206 g/mol
Appearance white powder,
Density 2.21 g/cm3
Melting point

251 °C

Boiling point


Solubility in water 99.3 g/100 mL
Solubility in ethanol 24 g/100 mL
MSDS External MSDS
EU Index Not listed
R-phrases R8, R36, R37, R38
S-phrases S17, S26, S27, S36, S37, S39
NFPA 704
NFPA 704.svg
Related compounds
Other cations Calcium perchlorate
Barium perchlorate
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Magnesium perchlorate is a powerful oxidizing agent, with the formula Mg(ClO4)2.

Magnesium perchlorate decomposes at 250 °C.[1] The heat of formation is -568.90 kJ mol-1.[2]

The enthalpy of solution is quite high, so reactions are done in large amounts of water to dilute it.

It is sold under the trade name anhydrone.

It was used as desiccant to dry gas or air samples,[3][4] but is no longer advised due to hazards inherent in perchlorates.[5] It is dried by heating at 250 °C under vacuum.


  1. ^ CRC Handbook
  2. ^ Lange's
  3. ^ H. H. Willard, G. F. Smith (1922). "The Preparation and Properties of Magnesium Perchlorate and its Use as a Drying Agent". Journal of the American Chemical Society 44 (10): 2255–2259. doi:10.1021/ja01431a022. 
  4. ^ L. Wu, H. He (1994). "Preparation of perlite-based magnesium perchlorate desiccant with colour indicator". The Chemical Educator 41 (5): 633–637. doi:10.1016/0039-9140(94)80041-3. 
  5. ^ W. L. F. Armarego and C. Chai (2003). Purification of laboratory chemicals. Oxford: Butterworth-Heinemann. ISBN 0750675713. 

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