1. The process of electrolysis can be used for the purification of copper. In this process, a thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Copper sulphate solution is used for this process. Answer the following questions with the information that you have now – (a) Explain, how does copper from impure copper get deposited over the thin plate of copper? (b) Write the chemical reactions that occur on-Anode, Cathode and in the Solution in this process. (c) Using autodraw.com, draw the set-up/ circuit used in the process of purification.
Answers
Copper ions are positively charged. They are attracted towards the plate which is connected to the negative terminal of the battery. As copper ions are transferred to the thin copper plate, this thin pure copper plate must be connected to the negative terminal of the battery. Consequently, impure copper rod is connected to the positive terminal of the battery.
Copper ions are positively charged. They are attracted towards the plate which is connected to the negative terminal of the battery. As copper ions are transferred to the thin copper plate, this thin pure copper plate must be connected to the negative terminal of the battery. Consequently, impure copper rod is connected to the positive terminal of the battery. Concept insight: When electric current is passed in this arrangement, copper ions from the solution get deposited on pure copper rod (attached to negative terminal) and copper ions from impure copper rod (attached to positive terminal) are liberated into the solution.
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Answer:
(a)it is because pure copper is electrolyzed that's why impure copper get deposit over thin layer of copper.
(b)Cu2+current→cu+Cu3
it is an endothermic reaction