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Unformatted text preview: 1-INTRODUCTIONI-Objective:--To obtain the transport number of H+and Cl-ions.-To obtain the mobilities of the H+and Cl-ions and compare it with the theoretical values.II-Theory:-The transference number Tiof ion i in a solution is defined as the fraction of the electric current carried by that ion. The moving boundary method is one of measuring Ti.(29(29Current =ChargeTime=Charge Per IonNumber Of IonsTimeand,N u m b e r O f Io n sT im eC o n c e n tr a tio n A r e a L e n g thT im e= The current carried by ion Iis :-IiF zicil At=If the total current is I, then by the definition of transference number :-TiIiIF zicilAIt==and,(29(29TiIIIuuu=+++-=+++-The ionic conductivity iof an ion is given by:-iuiF=------------ (a)and the equivalent conductivity for an ionic solution is the sum of the ionic conductivities :- =++------------- (b)Substituting equation (a) into (b) one gets:-(29 =++-F uuor,(29uuF+-+=The electrode reactions are:Anode:Cd sCdaqe()()++-22Cathode:AgCl seAg sClaq()()()++--Net:Cd s...
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- Fall '09