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Question
What is the action of water on magnesium? Write equations of the chemical reactions involved.
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Solution
Magnesium metal does not react with cold water. Magnesium reacts with hot water to form magnesium hydroxide and hydrogen.
\[\ce{\underset{Magnesium}{Mg_{(s)}} + \underset{(Hot)}{\underset{Water}{2H2O_{(l)}}} -> \underset{Magnesium hydroxide}{Mg(OH)2_{(aq)}} + \underset{Hydrogen}{H2_{(g)}}}\]
Magnesium reacts very rapidly with steam to form magnesium oxide and hydrogen.
\[\ce{\underset{Magnesium}{Mg_{(s)}} + \underset{Steam}{H2O_{(g)}} -> \underset{Magnesium oxide}{MgO_{(s)}} + \underset{Hydrogen}{H2_{(g)}}}\]
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