Answer to Question #133772 in General Chemistry for van sung

Question

Suppose a huge excess of zinc (i.e. 5 grams) was added. how would that affect the experiment? A cycle of reaction involving copper lab

Answer 1

zinc metal (Zn) is added to the copper solution to convert the copper ions back to copper 

metal, Cu(s). The resulting solution will contain colorless zinc ions, Zn²⁺(aq) and copper solid.

When the solution becomes colorless, all of the Cu²⁺ ions have been converted to Cu metal.

All of the excess Zn metal is also converted to Zn²⁺ion by the excess H₃O⁺ ions from the sulfuric acid, H₂SO₄(aq),used to dissolve the CuO precipitate

Once all the Zn metal is dissolved, the Cu metal can be isolated by decanting, or pouring off, the 

supernatant liquid.