Zinc reacts with copper hydroxide by the following oxidation-reduction reaction (unbalanced) in a basic medium:Zn(s) + Cu(OH)2(s)----> [Zn(OH)4]2- (aq) + Cu(s)a) Balance the reaction in a basic mediumb) Write down the two half reactions involved in this reaction, identifying the oxidation half reaction and the reduction half reaction. Using the data in Appendix B, find the standard oxidation and reduction potentials for each half reaction. Find the standard potential, E0reaction, of the global reactionOxidation half reaction: E0OX=Half reduction reaction: E0RED=E0 reaction:c) A stack is built using components of this reaction. Calculate the potential, Epile, of the battery at 25°C if the concentration of [Zn (OH)4]2-(aq) was 0.10 M and the pH of the solution was 12? (Hint: use the Nernst equation) APPENDICE B: Potentiels de réduction standards pour demi-réactions choisiesDemi-réactionE'red (V)1,23O2(g) + 4H*(aq) + 4 e → 2 H2O(1)Br2(1) + 2 e → 2 Br(aq)Ag*(aq) + e → Ag(s)Fe*(aq) + e → Fe²*(aq)Cu(OH)2(s) +2 e → Cu(s) + 2 OH(aq)2H*(aq) + 2 e → H2(g)Pb2+ (aq) + 2 e¯ → Pb(s)Ni²*(aq) + 2 e¯→ Ni(s)Cd2+(aq) + 2 e → Cd(s)Fe2*(aq) + e¯ → Fe(s)2 H20(1) + 2 e → H2 + 2 OH´(aq)Na*(aq) + e¯ →→ Na(s)[Zn(OH)4]²(aq) +2 e¯ → Zn(s) + 4 OH(aq)1,090,800,770,340,00-0,126-0,26-0,40-0,45-0,83-2,71-1,22

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Answered: APPENDICE B: Potentiels de réduction…

Chemistry

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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

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Zinc reacts with copper hydroxide by the following oxidation-reduction reaction (unbalanced) in a basic medium:
Zn(s) + Cu(OH)₂(s)----> [Zn(OH)₄]^2- (aq) + Cu(s)

a) Balance the reaction in a basic medium

b) Write down the two half reactions involved in this reaction, identifying the oxidation half reaction and the reduction half reaction. Using the data in Appendix B, find the standard oxidation and reduction potentials for each half reaction. Find the standard potential, E⁰_reaction, of the global reaction
Oxidation half reaction: E⁰_OX=
Half reduction reaction: E⁰_RED=
E⁰ _reaction:

c) A stack is built using components of this reaction. Calculate the potential, Epile, of the battery at 25°C if the concentration of [Zn (OH)₄]^2-(aq) was 0.10 M and the pH of the solution was 12? (Hint: use the Nernst equation)

APPENDICE B: Potentiels de réduction standards pour demi-réactions choisies
Demi-réaction
E'red (V)
1,23
O2(g) + 4H*(aq) + 4 e → 2 H2O(1)
Br2(1) + 2 e → 2 Br(aq)
Ag*(aq) + e → Ag(s)
Fe*(aq) + e → Fe²*(aq)
Cu(OH)2(s) +2 e → Cu(s) + 2 OH(aq)
2H*(aq) + 2 e → H2(g)
Pb2+ (aq) + 2 e¯ → Pb(s)
Ni²*(aq) + 2 e¯→ Ni(s)
Cd2+(aq) + 2 e → Cd(s)
Fe2*(aq) + e¯ → Fe(s)
2 H20(1) + 2 e → H2 + 2 OH´(aq)
Na*(aq) + e¯ →→ Na(s)
[Zn(OH)4]²(aq) +2 e¯ → Zn(s) + 4 OH(aq)
1,09
0,80
0,77
0,34
0,00
-0,126
-0,26
-0,40
-0,45
-0,83
-2,71
-1,22

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