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Unformatted text preview: KI NG FAHD UNI VERSI TY OF PETROLEUM & MI NERALS CHEMI STRY DEPARTMENT EXPERIMENTS IN PHYSICAL CHEMISTRY CHEM-311 Prepared For Dr. M. I. Wazeer EXP # 5 Transference of ions/moving boundary method DONE BY: Al- Ghamdi, Kamal S. I D# : 901432 SEC.#: 56 Date Of Performance: 03-4-1996 Date Of Submission: 10-4-1996 INTRODUCTION I-Objective:--To obtain the transport number of H + and Cl- ions.-To obtain the mobilities of the H + and Cl- ions. II-Theory:- The transference number T i of 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 T i . ( 29 ( 29 Current = Charge Time = Charge Per Ion Number Of Ions Time × N u m b e r O f Io n s T im e C o n c e n tr a tio n A r e a L e n g th T im e = × × The current carried by ion I is :- I i F z i c i l A t = If the total current is I , then by the definition of transference number :- T i I i I F z i c i lA It = = and, ( 29 ( 29 T i I I I u u u = + + +- = + + +- The ionic conductivity λ i of an ion is given by:- λ i u i F =------------ (a) and the equivalent conductivity for an ionic solution is the sum of the ionic conductivities:- Λ =...
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