Question

What is the standard cell potential for an electrochemical cell based on the following half-reactions? IO3-(aq)...

What is the standard cell potential for an electrochemical cell based on the following half-reactions?

IO3-(aq) + 6 H+(aq) + 6 e- ----> I-(aq) + 3 H2O(l ) E° = 1.085 V

Zn2+(aq) + 2 e- ---> Zn(s) E° = -0.762 V

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Answer #1

Given,

IO3-(aq) + 6 H+(aq) + 6 e- ----> I-(aq) + 3 H2O(l ) E° = 1.085 V

3 Zn2+(aq) + 6 e- ---> 3 Zn(s) E° = -0.762 V

=> 3 Zn -------> 3 Zn2+ + 6 e-                                                        E° = 0.762 V

Overall reaction :

3 Zn + IO3- + 6H+ -----> 3 Zn2+ + I- + 3H2O

Eo = 1.085 V + 0.762 V = 1.847 V = Standard cell potential

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