new coin having a mass of 2.5133 g is dissolved in nitric acid and only the resulting copper ions were plated out into a platinum cathode that has a mass of 12.0476 g. After all the copper ions have been reduced, the measured mass at the cathode was 12.1454 g. There was no increase in mass at the anode.  atomic weight:  Cu = 63.55 g/mol  A) What type of electroanalytical method was used?  B) Is lead present in the coin?

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A:

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A:

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Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electrolyte, electrodes, and some form of external power source are the main components required for conducting electrolysis. A partition, such as an ion-exchange membrane or a salt bridge, may also be used, but this is optional. These are primarily used to prevent the products from diffusing near the opposing electrode.