what are the main functions of Salt Bridge in Daniel cell
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A salt bridge, in electrochemistry, is a laboratory device used to connect the oxidation and reduction half-cells of a galvanic cell (voltaic cell), a type of electrochemical cell. It maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium.
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Explanation:
A commonly used form of salt bridge consists of a glass U- tube containing semi- solid paste of either KCl, or in gelatin or agar-agar jelly.
The electrolytes that are often used in salt bridge are called inert electrolytes which are supposed:
not to interact chemically weather of the solutions present in a anodic or cathodic Chambers.
not to interfere with overall cell reaction.
only those electrolytes can be used in a Salt Bridge in which mobility of Ions is almost the same.
Example, KCl, , etc.
A salt bridge carries out two important functions:
It allows only flow of Ions through it. Thus, the circuit is completed.
It also maintains the electrical neutrality.
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