OCR A Jun 2017 Paper 1 Q22

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22 This question is about redox, electrode potentials and feasibility. 22 Table 22.1 shows standard electrode potentials for four redox systems. You need to use this information to answer the questions below. Redox system Equation 1 2 3 4 Zn2+(aq) + 2e 2(aq) + 2H+(aq) + 2e Fe3+(aq) + e (aq) + 8H+(aq) + 5e SO4 MnO4 2(aq) + H2O(l) Zn(s) SO3 Fe2+(aq) Mn2+(aq) + 4H2O(l) E/ V 0.76 +0.17 +0.77 +1.51 Table 22.1 (a) A standard cell is set up in the laboratory based on redox systems 1 and 3 and the standard cell potential is measured. (i) Draw a labelled diagram to show how this cell could be set up to measure its standard cell potential. Include details of the apparatus, solutions and the standard conditions required to measure this standard cell potential. Standard conditions[4] (ii) Predict the standard cell potential of this cell. standard cell potential =V [1]<br /> 23 (b) In Table 22.1, what is the strongest reducing agent and the strongest oxidising agent? Strongest reducing agentStrongest oxidising agent[2] (c) Electrode potentials can be used to predict the feasibility of reactions. Construct an overall equation for the predicted reaction between the species in redox systems 2 and 4.[2]<br /> 24 BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE<br />

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