I assume you mean this reaction.
Mg + 2HCl -> MgCl2 + H2
That is hydrogen gas being given off. ( H2 )
Hydrogen gas is given off when magnesium reacts with sulfuric acid.
No acid is formed. The reaction produces hydrogen gas and magnesium chloride, a salt.
Hydrogen gas is produced when an acid reacts with a metal. This is because the acid reacts with the metal to form a salt and hydrogen gas.
Hydrogen. The same is true for when most metals react with an acid.
Hydrogen gas is given off when ethanoic acid (acetic acid) reacts with magnesium. This is a result of the displacement reaction between the acid and the metal.
Acid gives off hydrogen gas if it is hydrogen containing acid.
Hydrogen gas is given off when copper reacts with hydrochloric acid (HCl) according to the reaction: Cu + 2HCl -> CuCl2 + H2.
When acid reacts with certain metals, hydrogen gas is produced. The metal atoms displace the hydrogen ions in the acid, forming metal ions and hydrogen gas. The metal ion dissolves in the acid solution.
When acid is added to a metal, hydrogen gas is given off as a product of the reaction. This is because the acid reacts with the metal to form a salt and hydrogen gas. The general reaction is metal + acid → salt + hydrogen gas.
Hydrogen gas is given off when metal reacts with acid. e.g. Zn + 2HCl ------> ZnCl2 + H2
A salt. The type of salt depends on the type of acid.
When metal reacts with acid, hydrogen gas is produced. This is due to the displacement reaction where the metal displaces hydrogen from the acid to form hydrogen gas and a metal salt.