Use the standard reduction potentials at 25° C in Table 18.1 in Tro, Fridgen and Shaw, and calculate the standard emf E° of an electrochemical cell described by the following reaction: Fe + Ni^2+     →      Fe^2+ + Ni (b) What is the value of E if the concentration of Ni^2+ is 4.17 x 10^-2 and the concentration of Fe^2+ is 5.06 x 10^-3? (c) If E = 0.36 V and Ni^2+ = 0.10 M, what is the concentration of Fe^2

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