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expt 3 - transference number - M A PUA I NST I T U T E OF T...

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MAPUA INSTITUTE OF TECHNOLOGY School of Chemical Engineering, Chemistry, Biological Engineering, and Material Science and Engineering Physical Chemistry Laboratory 2 - 3 rd Quarter SY 2010-2011 Neil Patrick P. Tangara , 3 rd Year B.S. Chemical Engineering Experiment No. 3 TRANSFERENCE NUMBER Meynard Austria 1 , Neil Patrick Tangara, Darlene Pudolin, Emily Rose Santos, Aeiocellis Tan, Creza Loraine Talingting 2 1 Professor; 2 Students, all from CHM171L/A31, School of Chemical Engineering, Chemistry, Biological Engineering & Material Science and Engineering, Mapua Institute of Technology ABSTRACT This experiment intends to determine the transference numbers of both hydrogen & nitrate ions and relate it to their ionic mobilities. The transference numbers were determined using the Hittorf method which utilizes an equation derived from Faraday’s law and stoichiometric relationships. Hydrogen and nitrate ions were found to have transference numbers of 0.72012 and 0.27988, respectively. It was concluded that transference numbers largely depend on the ionic mobility of the ions involved. It was found that smaller ions tend to be more mobile and thus possess large values of transference number. This report will discuss why such a phenomenon occurs. Keywords : ionic mobility, transference number, Hittorf method, Faraday’s Law INTRODUCTION Cations and anions contribute to charge transport in electrolytic processes in accordance with their different mobilities in an electric field. Hittorf transport numbers characterise the fraction of the total charge transported by a particular ion during electrolysis. They enable the calculation of ionic conductivities, the values of which are important in electrochemical practice.
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