Hittorf’s Method for Determination of Transport Number

Hittorf’s Method for Determination of Transport Number

This method is based on the principle that the concentration changes occur around the electrodes due to the migration of ions. The apparatus used consists of a U-shaped tube, connected on one side to the “anode limb” and on the other side to the “cathode limb”. The anode is made of silver and cathode is made of platinum metal. The U-tube, the anode limb and cathode limb are filled with a standard solution of Ag NO3. The apparatus is connected in series to a silver voltmeter. A steady current of about 0.01 amperes is passed for about two to three hours. After that, the stopcocks S1 and S2 are closed. The whole of the solution from anode limb is taken out through stopcock S3 in a weighed flask. The silver content of this solution is determined by Volhard’s method. The weight of silver deposited in the silver voltameter is also determined.

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