What is meant by " Salt bridge avoids liquid junction potential which acts as internal resistance for the cell."?

Dear Student,

The liquid junction potential can be eliminated completely by placing a salt bridge usually consisting of a saturated solution of potassium chloride between the two liquids constituting the junction. When such a bridge is used, the ions in the bridge are present in large excess at the junction and they carry almost the whole of the current across the boundary thus eliminating the liquid junction potential.Hence,  The salt bridge acts just like internal resistance of the cell.


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