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# Lab 05 new - INTRODUCTION Objective 1 To determine the...

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INTRODUCTION Objective 1. To determine the temperature dependence of EMF and to calculate the thermodynamic functions , ∆G , ∆S and ∆H of the cell/reaction . 2.To determine the equilibrium constant K c from EMF measurements . Theory PART 1 TEMPERATURE DEPENDENCE OF EMF In this part of the experiment the following electrochemical cell is studied : Cd (s) Cd 2+ So 4 2- ( aq , c ) Cd ( Hg, X 2 ) The net cell reaction : Cd (s) → Cd (Hg, X 2 ) PART 2 DETERMATION OF EQUILIBRIUM CONSTANT We will study the reaction : Ag + (aq) + 2NH 3 = Ag(NH 3 ) 2 + (aq) The equilibrium constant K is given by K = a Ag(NH3)2+ / a Ag + a 2 NH3 The electrode potential is given as : E = E o – ( RT/F ) ln a AG+ PROCEDURE As indicated in the experiments' manual. 1

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DATA Part 1 Raw Data T ( o C) E (mV) 0 55.9 12 58.9 22 61.2 39 64.3 E ave = 0.072 mV Part 2 Raw Data C 2 (m) E (mv) 0.01 0.336 0.003 0.325 0.001 0.320 E ave = 0.332 mV CALCULATION PART 1 1. ∂Е/∂Т = 1551 y = -1551x + 130.54 0 10 20 30 40 0 0.02 0.04 0.06 0.08 0.1 TEPERATURE E
2. X 2 = 0.03512 , E = E o – ( RT / ZF ) ln ( X

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Lab 05 new - INTRODUCTION Objective 1 To determine the...

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