what will you use as anode, cathodeand material used as electrolyte:
1. if a brass article is to be electroplated with Nickle
2. if a iron spoon is electroplated with silver
3. if silver article electroplated with gold
Answers
Answer:
What are Cathode and Anode?
Let us understand what cathode and anode exactly mean. They are both defined by the flow of current. Therefore, a cathode is an electrode from which the current exits a polarized electrical device. Likewise, an anode is the electrode from which a current enters into a polarized electrical device.
The terms were finalized in 1834 by William Whewell who adapted the words from the Greek word (kathodos), ‘descent’ or ‘way down’. William had consulted with Michael Faraday for the coining of the terms.
Cathode and Anode
Cathode and Anode Example
Cathode
When we talk about cathode in chemistry, it is said to be the electrode where reduction occurs. This is common in an electrochemical cell. Here, the cathode is negative as the electrical energy that is supplied to the cell results in the decomposition of chemical compounds. However, it can also be positive as in the case of a galvanic cell where a chemical reaction leads to the generation of electrical energy.
In addition, a cathode is said to be either hot cathode or a cold cathode. A cathode which is heated in the presence of a filament to emit electrons by thermionic emission is known as a hot cathode whereas cold cathodes are not heated by any filament. A cathode is usually flagged as “cold” if it emits more electrons compared to the ones generated by thermionic emission alone.
Anode
In the most basic form, an anode in electrochemistry is the point where an oxidation reaction occurs. Generally, at an anode, negative ions or anions due to its electrical potential tend to react and give off electrons. These electrons then move up and into the driving circuit.
If we take a galvanic cell, the anode is negative in nature and the electrons mostly move towards the external part of the circuit. In an electrolytic cell, it is again positive. Additionally, an anode can be a plate or wire having an excess positive charge.
1. Nickel in Cathode and Brass in Anode.
2.Silver in Cathode and Iron spoon in Anode.
3.Gold in Cathode and Silver article in Anode.
What is Electroplating?
The process used here is electroplating
Electroplating is a process that uses an electric current to reduce dissolved metal cations so that they form a thin coherent metal coating on an electrode.
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