Magnesium perchlorate
Encyclopedia
Magnesium perchlorate is a powerful oxidizing agent
Oxidizing agent
An oxidizing agent can be defined as a substance that removes electrons from another reactant in a redox chemical reaction...

, with the formula Mg(ClO4)2.

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

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
Trade name
A trade name, also known as a trading name or a business name, is the name which a business trades under for commercial purposes, although its registered, legal name, used for contracts and other formal situations, may be another....

 anhydrone.

It was used as desiccant
Desiccant
A desiccant is a hygroscopic substance that induces or sustains a state of dryness in its local vicinity in a moderately well-sealed container....

to dry gas or air samples, but is no longer advised due to hazards inherent in perchlorates. It is dried by heating at 250 °C under vacuum.
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