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Magnesium fires

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When relatively small amounts of magnesium burns, the fires are extinguished using commercially available dry powder. Why might this fire rekindle days later as someone tries to remove the residue with water? What chemical process is involved here?

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Magnesium fires are Class D fires. Such fires are put out by dry powders that contain sodium chloride. Water reacts slowly with Mg to form Mg(OH)2 and H2 gas. But this ...

Solution Summary

The reasons for the rekindling of Magnesium fires when dry powders are used is discussed.

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