Magnesium perchlorate

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Magnesium perchlorate
CAS number 10034-81-8
Molecular formula Mg(ClO4)2
Molar mass 223.205 g/mol
Density 2,60 g/cm3
Melting point

251 °C

Boiling point


Solubility in water 99 g/100 g
MSDS External MSDS
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and 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]

Highly exothermic with addition of water, dilute with large amounts of water to offset this reaction.

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]


  1. CRC Handbook
  2. Lange's
  3. H. H. Willard, G. F. Smith (1922). "The Preparation and Properies 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. Butterworth-Heinemann. ISBN 0750675713. 

de:Magnesiumperchloratsr:Магнезијум перхлорат