20#15
Given the following half-reactions and associated standardreduction potentials:
AuBr−4(aq)+3e−→Au(s)+4Br−(aq)
E∘red=−0.858V
Eu3+(aq)+e−→Eu2+(aq)
E∘red=−0.43V
IO−(aq)+H2O(l)+2e−→I−(aq)+2OH−(aq)
E∘red=+0.49V
Sn2+(aq)+2e−→Sn(s)
E∘red=−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.
E∘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.
E∘min = _____ V
