Short notes on purification of metals
Answers
Purification of metal
The chemical effects of electric current is used in the purification of impure metals.
In the purification of an impure metal by using the chemical effects of current:
1)A thick rod of impure metal is made positive electrode or anode: It is connected to positive terminal of the battery.
2)A thin strip of pure metal is made negative electrode or cathode: It is connected to the negative terminal of the battery.
3)A water soluble salt of the metal to be purified is taken as electrolyte.
On passing electric current ,the metal dissolves from the impure anode and goes into electrolyte solution. The metal present in dissolved form in electrolyte get deposited on the cathode in the pure form. The impurities are left behind in the electrolyte solution. The metals like Copper ,zinc and Aluminium are purified by the process of electrolysis by using the chemical effects of electric current.
Answer:
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1. On passing electric current ,the metal dissolves from the impure anode and goes into electrolyte solution.
2. The impurities are left behind in the electrolyte solution.
3. The metals like Copper ,zinc and Aluminium are purified by the process of electrolysis by using the chemical effects of electric current.