Question

What is salt bridge write any two functions of salt bridge?

Answer 1

Answer:

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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Answer 2

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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, $<strong>K_2SO_4</strong>$, 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.