The mass of solid Mg used in the lab to reduce the copper ions is in excess of the minimum required. What happens to the unused (excess) Mg (s)?

a. The excess Mg (s) reacts with the copper compound produced from the original reduction reaction.

b. Nothing happens to the excess Mg (s).

c. Additional HCl (aq) is added and this reacts with the excess Mg (s) to form Mg ions (aq).

d. The excess is removed as Mg (s). After all, Cu (s) and Mg (s) do not look the same.

e. The solution is heated to remove the excess Mg (s).