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When magnesium metal reacts with dilute hydrochloric acid, the following chemical reaction occurs:
Mg + 2HCl → MgCl2 + H2
Magnesium chloride is a white, crystalline solid that is soluble in water. Hydrogen gas is a colorless, odorless gas that is lighter than air. The reaction is exothermic, meaning that it releases heat.
The observation when Mg reacts with dilute hydrochloric acid is the formation of bubbles of hydrogen gas. The reaction is relatively slow at first, but as the reaction proceeds, the rate of hydrogen gas production increases. The reaction will continue until either the magnesium or the hydrochloric acid is consumed.