Why copper is connected to anode for coating a layer of silver on copper plate
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Copper is a metal and electropositive in nature . therefore we set pure copper bar at cathode bcz positive ions attracted to negative rod . if we set pure copper at anode so there is no moving of electrons and electrorefining didn't placed.
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Electroplating Process
Chemistry
Electroplating Process
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What is Electroplating?
In the word ‘Electroplating’, ‘electro’ refers to electric current and ‘plating’ refers to an act of outer covering of some materials with a thin layer of a different metal.
Thus, electroplating definition is given as the process of plating a layer of any metal on other material by passing an electric current.
Electroplating is mainly done for avoiding corrosion of metals and for decorative purposes.Electroplating is a widely used process in many industries like automobiles, airplanes, electronics, jewelry, toys and many more.
Electroplating is conducted in an electrolytic cell. The metal to be electroplated is connected to the cathode. The electrolyte consists of the salt solution of metal with which electroplating has to be done. The electrolyte ionizes to give positively charged ions (metal ions) which move towards the anode for electroplating the desired object.
The Main Reason for Performing Electroplating are:
To make better appearance of the objects (e.g., shiny)
To protect the objects from corrosion
To enhance or give special engineering or mechanical features to abrasion, lubricity etc.
The Anode and Cathode
In the process of electroplating, an external source of electric current is usually applied. This takes place in an electrolytic cell. The electrode connected to the positive terminal of the battery is called anode, while the electrode connected to the negative terminal of the battery is called cathode. The electrochemical reduction reaction takes place at the cathode (negative terminal). The electrochemical oxidation reaction takes place at the anode (positive terminal).
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