Question

what is salt bridge???

Answer 1

$\huge\mathtt\red{Answer}$

$\longrightarrow$ 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.

Answer 2

$Question$ :-

→What is salt bridge?

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.

→What makes a salt bridge?

A salt bridge is a connection containing a weak electrolyte between the oxidation and reduction half-cells in a galvanic cell (e.g., voltaic cell, Daniell cell). If a cell is constructed without a salt bridge, one solution would quickly accumulate positive charge while the other would accumulate negative charge.

$Additional$ :-

• Salt bridges in proteins are bonds between oppositely charged residues that are sufficiently close to each. other to experience electrostatic attraction. They contribute to protein structure and to the specificity of.
• The purpose of a salt bridge is not to move electrons from the electrolyte, rather to maintain charge balance because the electrons are moving from one half cell to the other. The electrons flow from the anode to the cathode thus if a salt bridge is removed between the half cells, Voltage becomes zero.
• As to the salt bridge, it is best to use a salt that will not result in an unwanted reduction that might alter the operation of the salt (and particularly, the cathode). Potassium nitrate is a common choice, as potassium ions have very low tendency to reduce.

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