[Muonium]

Hi everyone! After putting Nickel metal in a concentrated hydrochloric acid and 3% hydrogen peroxide solution and heating it, I noticed brownish orange-yellow fumes filling the flask. There was gas production even after the liquid as cooled down.

Could Nickel in NiCl2 catalyses a decomposition reaction of the HCl and produce chlorine or byproducts like chlorine oxides?

The gas smell like HCl and a bit like sodium hypochlorite.

Thanks a lot!

[chenbeier]

The problem was the peroxide. HCl and H₂O₂ creates chlorine gas.