20#15 Given the following half-reactions and associated standard reduction potentials: AuBrâˆ’4(aq)+3eâˆ’â†’Au(s)+4Brâˆ’(aq) Eâˆ˜red=âˆ’0.858V Eu3+(aq)+eâˆ’â†’Eu2+(aq) Eâˆ˜red=âˆ’0.43V IOâˆ’(aq)+H2O(l)+2eâˆ’â†’Iâˆ’(aq)+2OHâˆ’(aq) Eâˆ˜red=+0.49V Sn2+(aq)+2eâˆ’â†’Sn(s) Eâˆ˜red=âˆ’0.14V a) Write the cell reaction for the combination...

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Chemistry

20#15
Given the following half-reactions and associated standardreduction potentials:
AuBrâˆ’4(aq)+3eâˆ’â†’Au(s)+4Brâˆ’(aq)
Eâˆ˜red=âˆ’0.858V
Eu3+(aq)+eâˆ’â†’Eu2+(aq)
Eâˆ˜red=âˆ’0.43V
IOâˆ’(aq)+H2O(l)+2eâˆ’â†’Iâˆ’(aq)+2OHâˆ’(aq)
Eâˆ˜red=+0.49V
Sn2+(aq)+2eâˆ’â†’Sn(s)
Eâˆ˜red=âˆ’0.14V
a) Write the cell reaction for the combination of thesehalf-cell reactions that leads to the largest positive cellemf.
b) Calculate the value of this emf.
Eâˆ˜max = _ V
c) Write the cell reaction forthe combination of half-cell reactions that leads to the smallestpositive cell emf.
d) Calculate the value ofthis emf.
Eâˆ˜min = _ V

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3.7 Ratings (580 Votes)

a the highest positive emf will be for the combination where anode has lowest standard reduction potential Cathode has highest standard reduction See Answer

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