Pourbaix diagram for aluminum (Al) at 25°C is given in Figure Q2. Assume [Al³*] = 10* M,and [AlO,] = 10 M.(i) Give the chemical reaction for the vertical line (B) in Figure Q2.(ii) Determine the equilibrium constant K for this chemical reaction.040.2ALO,AlO,0.0--0.2(B)las-0.4-0.6--0.8--1.0--1.24-14CorrosionPassivationCorresionAl-2.4.Immunity-2 -1 0I 23 45 6 78 9 10 11 12 13 14pllFigure Q2ReactionEº, V2H+ + 2e H2Pb2+ + 2e + Pb0.0000 Standard hydrogen electrode-0.126Sn2+ + 2e" → Sn-0.138Mo3+ + 3e" +→ Mo-0.200Ni2+ + 2e > Ni-0.257Co2+ + 2e → Co-0.28Cd2+ + 2e CdFe2+ + 2e + FeCr3+ + 3e + Cr-0.403-0.447-0.744Zn2+ + 2e Zn-0.762Nh3+ + 3e Nb-1.099(also called Columbium, Cb)Mn2+ + 2e" Mn-1.185Zr4+ + 4e" Zr-1.45Ti2+ + 2e + Ti-1.630Al3+ + 3e +→ Al-1.662Potential (V)

Pourbaix diagram is also called potential or pH diagram. It is a plot of thermodynamical stable…

Pourbaix diagram for aluminum (Al) at 25°C is given in Figure Q2. Assume [Al**] = 10* M, and [AlO;] = 10 M. (i) Give the chemical reaction for the vertical line (B) in Figure Q2. (ii) Determine the equilibrium constant K for this chemical reaction. 0.6 04 02 0.0- ALO, AlO, -0.2 (B) -0.4 0.6- -0.8 1.0- -1.2- -14 1.6 Corrosion Passivation Corrosion 2.0- -22 Al Immunity -2 -1 0I2 3 56789 10 11 12 13 14 pll Figure Q2 Eº, V 0.0000 Standard hydrogen electrode Reaction 2H+ + 2e +→ H2 Pb2+ + 2e Pb -0.126 Sn2+ + 2e" + Sn -0.138 Mo3+ + 3e" Mo -0.200 Ni2+ + 2e" > Ni -0.257 Co2+ + 2e + Co Cd2+ + 2e Cd Fe2+ + 2e + Fe -0.28 -0.403 -0.447 Cr3+ + 3e + Cr -0.744 Zn2+ + 2e" +→ Zn -0.762 Nh3+ + 3e" → Nb -1.099 (also called Columbium, Cb) Mn2+ + 2e ( Mn -1.185 Zr+ + 4e" → Zr -1.45 Ti2+ + 2e → Ti -1.630 Al3+ + 3e + Al -1.662 Potential (V) ---- i ei eir

Pourbaix diagram for aluminum (Al) at 25°C is given in Figure Q2. Assume [Al**] = 10* M, and [AlO;] = 10 M. (i) Give the chemical reaction for the vertical line (B) in Figure Q2. (ii) Determine the equilibrium constant K for this chemical reaction. 0.6 04 02 0.0- ALO, AlO, -0.2 (B) -0.4 0.6- -0.8 1.0- -1.2- -14 1.6 Corrosion Passivation Corrosion 2.0- -22 Al Immunity -2 -1 0I2 3 56789 10 11 12 13 14 pll Figure Q2 Eº, V 0.0000 Standard hydrogen electrode Reaction 2H+ + 2e +→ H2 Pb2+ + 2e Pb -0.126 Sn2+ + 2e" + Sn -0.138 Mo3+ + 3e" Mo -0.200 Ni2+ + 2e" > Ni -0.257 Co2+ + 2e + Co Cd2+ + 2e Cd Fe2+ + 2e + Fe -0.28 -0.403 -0.447 Cr3+ + 3e + Cr -0.744 Zn2+ + 2e" +→ Zn -0.762 Nh3+ + 3e" → Nb -1.099 (also called Columbium, Cb) Mn2+ + 2e ( Mn -1.185 Zr+ + 4e" → Zr -1.45 Ti2+ + 2e → Ti -1.630 Al3+ + 3e + Al -1.662 Potential (V) ---- i ei eir

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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