Question

The metal which can be purified by electrolytic method is

Answer 1

The metal which can be purified by electrolytic method is copper.

hope it will help

Answer 2

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.

Activity : To purify impure copper metal



Take 250 ml of distilled water in a clean beaker.Dissolve two teaspoon full of copper sulphate in it. Add few drops of dilute sulphuric acid to copper sulphate solution. A thick rod of impure copper metal is made positive electrode by connecting it to the positive terminal of the battery. A thin plate of of pure copper metal is made negative electrode by connecting it to the negative terminal of the battery. Switch on the electric current by closing the switch. Allow the current to pass for about half an hour. It will be observed that the impure copper rod goes on becoming thinner and thinner.This is because the impure copper metal of anode goes on dissolving in copper sulphate solution where the pure metal from copper sulphate solution goes on depositing on copper plate cathode. Impurities present in impure rod of copper fall to the bottom of the beaker.