Describe the electrolytic refining method for the purification of… - Vidyadip

Question

Describe the electrolytic refining method for the purification of metals.###Explain the electrolytic refining of copper with the help of a diagram.

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Answer

The metals obtained from their ores are not very pure. Hence, it is essential to purify the metals. The most widely used method for refining impure metals is electrolytic refining.

→ Metals such as copper, zinc, tin, nickel, silver and gold are refined by electrolytic process. In this process, the impure metal is made the anode and a thin strip of pure metal is made the cathode.
→ A solution of the metal salt is used as an electrolyte.
→ The apparatus is set up as shown in the figure 3.8.
→ On passing the electric current through the electrolyte, the pure metal from the anode dissolves into electrolyte. An equivalent amount of pure metal from the electrolyte is deposited on the cathode.
For example,

→ The soluble impurities pass into the solution while the insoluble impurities such as gold, silver, platinum are settled at the bottom of the anode and are called anode-mud.

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