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What’s the Balanced Equation for Magnesium and Hydrochloric Acid

Answer: The balanced chemical equation is:

Mg(s) + 2HCl → MgCl2(aq) + H2(g) 

Explanation:

The interaction between magnesium and hydrochloric acid produces a magnesium chloride salt and hydrogen gas. This is an example of a single replacement reaction. 

This is a famous example of a metal reacting in acid to release hydrogen gas in a single replacement reaction. 

Magnesium acts as a reducing agent because it reduces hydrogen to hydrogen gas while also being oxidised. Hydrochloric acid, on the other hand, acts as an oxidising agent, oxidising magnesium to magnesium cations while getting reduced in the process.