To test whether a liquid allows electric current to pass through it or not, we can use the same tester.
When the liquid between the two ends of the tester allows the electric current to pass, the circuit of the tester becomes complete. The current flows in the circuit and the bulb glows.
When salt is dissolved in distilled water, we obtain salt solution. This is a conductor of electricity.
The passage of an electric current through a conducting solution causes chemical reactions. As a result, bubbles of a gas may be formed on the electrodes. Deposits of metal may be seen on electrodes. Changes of colour of solutions may occur. These are some of the chemical effects of the electric current.
The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating.
Electroplating is one of the most common applications of chemical effects of electric current.
It is a very useful process. It is widely used in industry for coating metal objects with a thin layer of a different metal. The layer of metal deposited has some desired property, which the metal of the object lacks.