Problem: Using the following standard reduction potentials, Fe3+ (aq) + e–   → Fe2+ (aq)  E°red = +0.77 V Pb2+ (aq) + 2 e– → Pb (s)      E°red = –0.13 V   Calculate the standard emf for the following cell reaction as written and determine whether or not the reaction is spontaneous or non‐spontaneous: Pb2+ (aq) + 2 Fe2+ (aq) → 2 Fe3+ (aq) + Pb (s) a) –0.90 V, non‐spontaneous b) –0.90 V, spontaneous c) +0.90 V, non‐spontaneous d) –0.64 V, non‐spontaneous e) +0.64 V, spontaneous  

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Problem Details

Using the following standard reduction potentials,

Fe3+ (aq) + e   → Fe2+ (aq)  E°red = +0.77 V

Pb2+ (aq) + 2 e → Pb (s)      E°red = –0.13 V

 

Calculate the standard emf for the following cell reaction as written and determine whether or not the reaction is spontaneous or non‐spontaneous:

Pb2+ (aq) + 2 Fe2+ (aq) → 2 Fe3+ (aq) + Pb (s)

a) –0.90 V, non‐spontaneous

b) –0.90 V, spontaneous

c) +0.90 V, non‐spontaneous

d) –0.64 V, non‐spontaneous

e) +0.64 V, spontaneous

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