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Hi, do you guys know whats the theoretical diferemce between those proces? (they have the same apparent result. A cuper cape is formed on an iron nail)a. -Grab the (washed) iron nail -Fill a beaker with CuSO4 1M -Put the iron nail on it -After 15 minutes, a small cape of cuper is formed around the iron nail.b -In a clen beaker, put 50 ml of CuSO4 1M and 50 ml of H2SO4 -Use the iron nail as cathode and a cuper piece as anode. Introduce them in the beaker and conect it to a 6v battery. -After 15 minutes, another small cape of cuper is formed around the iron nail.[diagram=267_0]
Process A works just fine, 15 minutes is plenty of time to copper coat the nail. In this case the energy required to remove the copper from the solution is supplied by the energy released as the nail (iron or zinc) dissolves. Once all the nail is covered up the process stops.