Moving Boundary Method for Determination of Transport Number



MOVING BOUNDARY METHOD

This method is based on the direct observation of the migration of ions under the influence of an applied electric field. Let us consider Hydrochloric acid and the transport numbers of H+ and CI ions present in HCI have to be determined. The hydrochloric acid is called the principal or experimental electrolyte. Another electrolyte containing a common ion (Cl-) called the indicator electrolyte is selected. The speed of the cation of the indicator electrolyte is selected. The speed of the cation of the indicator electrolyte should be less than that of the cation of the experimental electrolyte. For example: CdCl2 can be selected as the indicator electrolyte as the speed of Cd++ ion is less than that of H+ ions. A concentrated solution of CdCl2 is used, so that HCI solution can float on it.

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