please help ASAP Standard electrode potentials at 25 o C. Determine which of the

Question

please help ASAP

Standard electrode potentials at 25oC.

Determine which of the following pairs of reactants will result in a spontaneous reaction at 25oC.

Ag+(aq) + Br-(aq)

Li+(aq) + Al(s)

Pb2+(aq) + Cu(s)

Fe3+(aq) + Ni(s)

Reduction Half-Reaction Eo(V) F2(g) + 2e- 2F-(aq) 2.87 MnO4-(aq) + 4H+(aq) + 3e- MnO2(s) + 2H2O(l) 1.68 MnO4-(aq) + 8H+(aq) + 5e- Mn2+(aq) + 4H2O(l) 1.51 ClO2(g) + e- ClO2-(aq) 0.95 Ag+(aq) + e- Ag(s) 0.80 MnO4-(aq) + e- MnO42-(aq) 0.56 Cu2+(aq) + 2e- Cu(s) 0.34 2H+(aq) + 2e- H2(g) 0 Fe3+(aq) + 3e- Fe(s) -0.036 Pb2+(aq) + 2e- Pb(s) -0.13 Sn2+(aq) + 2e- Sn(s) -0.14 Ni2+(aq) + 2e- Ni(s) -0.23 Cd2+(aq) + 2e- Cd(s) -0.40 Fe2+(aq) + 2e- Fe(s) -0.45 Cr3+(aq) + 3e- Cr(s) -0.73 Zn2+(aq) + 2e- Zn(s) -0.76 Mg2+(aq) + 2e- Mg(s) -2.37 Ba2+(aq) + 2e- Ba(s) -2.90

Explanation / Answer

Ag+(aq) + Br-(aq) AgBr (spontaneous) since E> 0

Li+(aq) + Al(s) No reaction since Li+ wont oxidize Al, Eli < Eal

Pb2+(aq) + Cu(s) No reaction since E Copper > E lead

Fe3+(aq) + Ni(s) reduction occurs, this is spontaneous

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