Question

2. According to your observations, which reactant was present for the longest period of time

in the first reaction with 0.51 g CuCl2? Is this the limiting or excess reagent? Explain.

Answer 1

The reaction present for the longest period of time in reaction with 0.51 g of CuCl2 is the limiting reagent.

Step-by-step explanation:

In a reaction when the substance is consumed and the reaction ends and there will be no more further reaction to take place is called as limiting reaction.

2Al(s) + 3CuCl2(aq) ------> 3Cu(s) + 2AlCl3(aq)

When Aluminium is reacted with copper (II) chloride, there will be a formation of Copper ion and Aluminium chloride. In aqueous solution, copper (II) chloride turns into light blue color due to Cu 2+ ions and ammonium chloride is colorless in aqueous solution.

Copper is the oldest metal used by mankind. The copper (II)chloride oxidation reaction has been used in the sweetening process and for etching regeneration.