# When dilute HCl reacts with Zinc metal, which gas is liberated?

When dilute HCl reacts with Zinc metal, hydrogen gas is liberated.

### The reaction between zinc metal and HCl

Zn + HCl → H2 + ZnCl2

Zinc reacts easily with the acid to produce hydrogen bubbles. It is a single displacement reaction in which hydrogen is displaced by zinc metal to form hydrogen gas and a salt, zinc chloride. To produce bubbles of hydrogen, zinc reacts rapidly with the acid. Zinc chloride is formed when Zn is combined with dilute sulphuric acid and hydrogen gas is liberated. The reaction is exothermic, and thus the reaction generates heat.