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QUESTION 6 [21 marks) 6.1 A voltaic cell consists of a strip of cadmium metal in a solution of Co{NOs) in one beaker and in the other beaker a platinum electrode is immersed in a NaCl solution with Cl gas bubbled around the electrode. A salt bridge connects the two beakers 131 (a) Which electrode serves as the anode and which as the cathode? (Give the two hall reactions and their E) (b) Calculate the standard cell potential (c) Does the Co electrode gain or lose mass as the cell reaction proceeds? 121 111 62 At 298 K a cell reaction has a standard cell potential of +0.17 V The equilibrium constant for the reaction is 55 X 105 What is the value of n for the reaction? 13) 6.3 The reduction of ferric ion by iodide is given by the following reaction 2Fe+(aq)+21*(aq) - 2Fe?"(aq) + la(s) (2) Write the oxidation and reduction half reactions and give their standard reduction potentials in v 121 (b) Calculate AG' for this reaction 14) (c) is the reaction spontaneous? Explain the choice of your answer 121 6.4 Calculate the quantity of electrical charge needed to plate 1386 mol Cr from an acidic solution of H.Cr,0, according to the following half-equation HzCr 0,(aq) + 12H + (aq) + 12 --- 20(s) + 7H0(1) 141