Saturated solution of KNO_3 is used to make a | vedclass

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(C) salt bridge is used to maintain electrical neutrality in the two half-cells of an electrochemical cell.For this purpose,the electrolyte used in th

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Mobilities of $K^{\oplus}$ and $NO_3^{\Theta}$ are almost the same

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(C) salt bridge is used to maintain electrical neutrality in the two half-cells of an electrochemical cell.For this purpose,the electrolyte used in the salt bridge must have ions with nearly equal ionic mobilities (or transport numbers).$KNO_3$ is chosen because the ionic mobility of $K^{\oplus}$ $(73.5 	imes 10^{-4} \ m^2 \ S \ mol^{-1})$ and $NO_3^{\Theta}$ $(71.4 	imes 10^{-4} \ m^2 \ S \ mol^{-1})$ are almost the same.This ensures that the liquid junction potential is minimized and the flow of ions balances the charge accumulation effectively.

Saturated solution of $KNO_3$ is used to make a salt bridge because

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