4. Sanjay was asked to purify the given sample of impure copper. He constructed a
cell by using impure copper as the cathode and a pure thin copper strip as the
anode. The electrolyte used was acidified copper sulphate. On passing electric
current, no reaction was observed in the experimental set-up. He realised his
mistake and connected the electrodes in the reverse order. He was then
successful in his project.
(i) What was the mistake done by Sanjay?
(ii) How did he rectify it?
(iii) Write a chemical equation for the reaction that has taken place after
rectification and name the process.
Answers
Answer:
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Explanation:
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Answer:
Explanation:
In the copper purification process, the pure copper plate is to be coated with copper from the impure copper plate, so the pure copper plate is the cathode.
Therefore, the negative terminal of the battery should be connected to the pure copper plate, that is, A and the anode is the impure plate of copper, that is, B, from which the copper has to be coated on the pure copper plate. Here, the solution can be a salt solution called copper sulphate solution which is a metallic salt solution.
During the electroplating process or the purification process rather, the copper from the impure plate A is transferred to the pure copper plate B, through the electrolytic copper sulphate solution.
Hence, The negative ion P is SO4