In the production of printed circuit boards for the elec¬tronics industry, a 0.60-mm layer of copper is

Question:

In the production of printed circuit boards for the elec¬tronics industry, a 0.60-mm layer of copper is laminated onto an insulating plastic board. Next, a circuit pattern made of a chemically resistant polymer is printed on the board. The unwanted copper is removed by chemical etching, and the protective polymer is finally removed by solvents. One etching reaction is

a. Is this reaction an oxidation-reduction process? Explain.
b. A plant needs to manufacture 10,000 printed circuit boards, each 8.0 cm X 16.0 cm in area. An average of 80.% of the copper is removed from each board (density of copper = 8.96 g/cm3). What masses of [Cu(NH3)4]Cl2 and NH3 are needed to accomplish this task? Assume 100% yield.