<P> Sodium hypochlorite reacts with strong acids such as hydrochloric acid to release chlorine gas: </P> <Dl> <Dd> NaClO + 2 HCl → Cl + H O + NaCl </Dd> </Dl> <Dd> NaClO + 2 HCl → Cl + H O + NaCl </Dd> <P> It reacts with weak acids, such as acetic acid, to release hypochlorous acid (at pH <2, chlorine gas evolves): </P>

The mixing of sodium metal and chlorine gas would be the type of reaction known as