Problem: For the reaction3 Ni2+(aq) + 2 Cr(OH)3(s) + 10 OH- (aq)  →  3 Ni(s) + 2 CrO42-(aq) + 8 H2O(l)   G = +87 kJ/molGiven the standard reduction potential of the half-reaction Ni2+(aq) + 2 e-  →  Ni(s) Ered = -0.28 V, calculate the standard reduction potential of the half-reactionCrO42-(aq) + 4 H2O(l) + 3 e-  →  Cr(OH)3(s) + 5 OH-(aq)

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For the reaction

3 Ni2+(aq) + 2 Cr(OH)3(s) + 10 OH- (aq)  →  3 Ni(s) + 2 CrO42-(aq) + 8 H2O(l)   G = +87 kJ/mol

Given: 

(Ni2+(aq) + 2 e- →  Ni(s)) x 3                                                                       Ered = -0.28 V

(CrO42-(aq) + 4 H2O(l) + 3 e- Cr(OH)3(s) + 5 OH-(aq)) x 2

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3 Ni2+(aq) + 6 e- →  3 Ni(s)

2 CrO42-(aq) + 8  H2O(l) + 6 e- 2 Cr(OH)3(s) + 10 OH-(aq)


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Problem Details

For the reaction

3 Ni2+(aq) + 2 Cr(OH)3(s) + 10 OH- (aq)  →  3 Ni(s) + 2 CrO42-(aq) + 8 H2O(l)   G = +87 kJ/mol

Given the standard reduction potential of the half-reaction Ni2+(aq) + 2 e-  →  Ni(s) Ered = -0.28 V, calculate the standard reduction potential of the half-reaction

CrO42-(aq) + 4 H2O(l) + 3 e-  →  Cr(OH)3(s) + 5 OH-(aq)


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