Describe salt bridge and its function

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Describe salt bridge and its function

Posted by Ankit Chauhan 5 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Mr. Badmash 5 years, 6 months ago

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.

2Thank You

Yogita Ingle 5 years, 6 months ago

Salt bridge is an inverted U-tube like structure.
The tube is filled with concentrated solution of an inert electrolyte.
The electrolyte does not undergo any sort of chemical reaction nor does it reacts with concentrated solution in the two half cells.
Most of the time salts like KCl, KNO₃, NH₄NO₃ are used as electrolyte.
Salt bridge is constructed by filing the U-tube with a mixture prepared by mixing agar-agar or gelatin with a hot concentrated solution of the electrolyte.
The apparatus is then cooled and consequently the solution fixes within the U-tube in the form of gel.
This prevents the intermixing of fluids.
The either ends of the tube are then sealed using cotton wool in order to reduce diffusion.
The main advantage of suing this bridge is that it prevents the arousal of potential difference (also called liquid junction potential) when two solutions are in contact with each other.
It completes the electrical circuit as it connects the electrolytes in the two half cells.
It avoids the chances of diffusion of solutions between the half cells.
It maintains electrical neutrality by providing a path for the movement of ions.