a) Using data in Table 20.1, calculate the standard emf for a cell that employs the following overall cell reaction: 2 Al(s) + 3 I2(s) - 2 Al3+(aq) + 6 I (aq) b) Calculate the emf generated by the same cell when [Al3+] = 4.0 x 10-3 M and [I] = 0.010 M.

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TABLE 20.1 Standard Reduction Potentials in Water at 25°C
Potential (V)
Reduction Half-Reaction
F2(g) + 2 e
MnO4 (aq) + 8 H*(aq) + 5 e¯
Cl2(8) + 2 e
Cr20,2 (aq) + 14 H*(aq) + 6 e-
O2(g) + 4 H*(aq) + 4 e
Br2(1) + 2 e
NO3 (aq) + 4 H" (ад) + 3е
Ag*(aq) + e¯
Fe (aq) + e¯
O2(g) + 2 H*(aq) + 2 e¯
MnO4 (aq) + 2 H2O(1) + 3 e¯
I2(s) + 2 e
O2(8) + 2 H2O(1) + 4 e¯
Cu²“(aq) + 2 e
2 H"(ag) + 2 е
Ni2+(aq) + 2 e
Fe2*(aq) + 2 e
Zn"(aq) + 2 e
2 H20(1) + 2 e
Al3+(ag) + 3 e
Na*(aq) + e¯
Li*(aq) + e
+2.87
2 F (aq)
+1.51
Mn2+(aq) + 4 H2O(1)
+1.36
→ 2 CI (aq)
2 Cr* (aq) + 7 H2O(!)
2 H2O(1)
.3+
+1.33
>
+1.23
+1.06
→ 2 Br (aq)
+0.96
NO(g) + 2 H2O(1)
Ag(s)
Fe2*(aq)
+0.80
>
3+
+0.77
>
H2O2(aq)
MnO2(s) + 4 OH (aq)
+0.68
+0.59
>
+0.54
21 (aq)
+0.40
→ 4 OH (aq)
+0.34
→ Cu(s)
0 [defined]
H2(g)
Ni(s)
→ Fe(s)
-0.28
-0.44
2+
-0.76
Zn(s)
H2(g) + 2 OH (aq)
→ Al(s)
Na(s)
-0.83
-1.66
-2.71
-3.05
Li(s)
Copyright © 2006 Pearson Prentice Hall, Inc.
Transcribed Image Text:TABLE 20.1 Standard Reduction Potentials in Water at 25°C Potential (V) Reduction Half-Reaction F2(g) + 2 e MnO4 (aq) + 8 H*(aq) + 5 e¯ Cl2(8) + 2 e Cr20,2 (aq) + 14 H*(aq) + 6 e- O2(g) + 4 H*(aq) + 4 e Br2(1) + 2 e NO3 (aq) + 4 H" (ад) + 3е Ag*(aq) + e¯ Fe (aq) + e¯ O2(g) + 2 H*(aq) + 2 e¯ MnO4 (aq) + 2 H2O(1) + 3 e¯ I2(s) + 2 e O2(8) + 2 H2O(1) + 4 e¯ Cu²“(aq) + 2 e 2 H"(ag) + 2 е Ni2+(aq) + 2 e Fe2*(aq) + 2 e Zn"(aq) + 2 e 2 H20(1) + 2 e Al3+(ag) + 3 e Na*(aq) + e¯ Li*(aq) + e +2.87 2 F (aq) +1.51 Mn2+(aq) + 4 H2O(1) +1.36 → 2 CI (aq) 2 Cr* (aq) + 7 H2O(!) 2 H2O(1) .3+ +1.33 > +1.23 +1.06 → 2 Br (aq) +0.96 NO(g) + 2 H2O(1) Ag(s) Fe2*(aq) +0.80 > 3+ +0.77 > H2O2(aq) MnO2(s) + 4 OH (aq) +0.68 +0.59 > +0.54 21 (aq) +0.40 → 4 OH (aq) +0.34 → Cu(s) 0 [defined] H2(g) Ni(s) → Fe(s) -0.28 -0.44 2+ -0.76 Zn(s) H2(g) + 2 OH (aq) → Al(s) Na(s) -0.83 -1.66 -2.71 -3.05 Li(s) Copyright © 2006 Pearson Prentice Hall, Inc.
a) Using data in Table 20.1, calculate the standard emffor a cell that employs the
following overall cell reaction:
2 Al(s) + 3 I2(s) →
2 Al3+(aq) + 6 I (aq)
b) Calculate the emfgenerated by the same cell when [Al3+] = 4.0 x 10-3 M and [I-] =
0.010 M.
Transcribed Image Text:a) Using data in Table 20.1, calculate the standard emffor a cell that employs the following overall cell reaction: 2 Al(s) + 3 I2(s) → 2 Al3+(aq) + 6 I (aq) b) Calculate the emfgenerated by the same cell when [Al3+] = 4.0 x 10-3 M and [I-] = 0.010 M.
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