Question

what is Salt Bridge? mention its function..

Answer 1

Salt Bridge: A salt bridge is a U- shape containing concentrated solution of an inert electrolyte like KCl, KNO3, K2SO4 etc.or a solidified solution of those electrolytes in agar-agar solution and gelatin.

These inert electrolytes do not take part in redox reaction of the cell and even dont react with the electrolyte used.

Function: the main functions of a salt bridge are;

They allow the movement of ions from one solution to another without mixing of the two solutions and complete the electrical circuit.To maintain the electical neutrality of the solutions in the two half cells.

 

Answer 2

Explanation:

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$\longrightarrow$ A commonly used form of salt bridge consists of a glass U- tube containing semi- solid paste of either KCl, $KNO_3$ or $NH_4Cl$ in gelatin or agar-agar jelly.

$\longrightarrow$ 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, $K_2SO_4$, etc.

$\longrightarrow$ 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.