Standard Reduction Potentials at 25°C E(V) 2.87 +2.07 +1.82 Half-Reaction 03(g)

Question

Standard Reduction Potentials at 25°C E(V) 2.87 +2.07 +1.82 Half-Reaction 03(g) + 2H+(aq) + 2e-_O2(g) + H2O Co3+(aq) + e- Co2+(aq) o (a H2O2(aq) + 2H+(aq) 2e-- 2H20 Cu2+(aq) + 2e- Cu(s) AgCl(s) + e--Ag(s) + Cl"(aq) SO'"(aq) + 4H'(aq) + 2e-_ SOgg) + 2H2O Cu2+(aq) + e-_ Cu+(aq) sn'+(aq) + 2e-_ Sn2+(aq) 2H+(aq) + 2e H2(g) Pb2+(aq) + 2e"- Pb(s) Sn2(aq) 2e Sn(s) Ni2+(aq) + 2e Ni(s) +0.34 0.22 +0.20 +0.15 0.13 0.00 0.13 0.14 0.25 -0.28 0.31 0.40 0.44 0.74 0.76 0.83 1.18 1.66 1.85 Cd2+(aq) + 2e- Cd(5) Fe2+(aq) + 2e Fe(s) Cr(s) Zn2+(aq) + 2e-_ Zn(s) 2H20 2eH2(g) +20H (aq) Mn2+(aq) + 2e Mn(s) Al(a) 3eAI(s) 2+

Explanation / Answer

Al(NO3)3 -------> Al+3 + 3NO3-

Co(NO3)2 -------> Co+2 + 2No3-

Al ---------> Al+3 + 3e-           E0   = 1.66V

Co+2 + 2e- ------> Co           E0 = -0.28V

2Al -----------> 2Al+3 + 6e-     E0 = 1.66V

3Co+2 + 6e-   -------> 3Co     E0   = -0.28V

----------------------------------------------------

2Al + 3Co+2 --------> 2Al+3 +3Co   E0Cell   = 1.38V

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