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Question

What is the nature of electrolyte used in a salt bridge?


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Solution

Salt bridge:

  • The salt bridge is used in electrochemical cells to connect the oxidation/reduction half cells of a galvanic cell.
  • The salt bridge is usually comprised of a strong electrolyte which is further made up of ions.
  • Examples of strong electrolytes are Silver nitrateAgNO3 or Potassium chloride KCl.

Nature of electrolytes:

  • In a salt bridge, inert electrolytes are used as their ions are not involved in any electrochemical change.

Functions of salt bridge:

  • It is used to maintain electrical neutrality inside the circuit of a galvanic cell.
  • It acts as an electrical connection between two half cells.
  • It prevents the diffusion of solution from one cell to the other.

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