I did and experiment on the reactions of copper. My initial mass was 0.511 g and the final mass was 0.395 g. In what type of reaction did copper lose its mass? the reactions or procedures were:- reaction of copper with nitric acid. sodium hydroxide is later added.- copper oxide is filtered and HCl is added.- NH3 is added to the resulting solution.- H2SO4 is added.Zinc strips is added.- H2SO4 is added-resulting solution is filtered to obtain copper.These were the types of reactions: oxidation-reduction, displacement, decommposition.
Copper does not lose mass. Maybe you were a bit careless and lost some copper or part of a copper compound while doing your procedure - filtration, perhaps? At some point, you had Copper ions present - perhaps you failed to use sufficient reagent to recapture them all.
