Write and name the halfreactions assiciated with the followingredox reaction and

Question

Write and name the halfreactions assiciated with the followingredox reaction and the balanced redox equation.

   Cr(s) + Co2+ (aq)  <--------> Cr3+(aq) + Co (s)

          a.Determine the standard cell potential for the reaction?

          b.What would the cell potential be if 3.00 moles of Cr(s) insteadof 1.00 mole were used?Why?

c. Is it a voltaic or electrolytic cell ?


d Draw a cell diagram for the cell. Label the electrodes, give the sign of each
electrode, and show the electron flow outside the cell and ion flow in the salt
bridge. Use the other side of the paper to draw your diagram.

e. Calculate the value of the Faraday if 3.671 coulombs of electricity gave 4.828 mg
of iodine, I2, from an aqueous NaI solution.

Explanation / Answer

The overall reaction and equilibrium constant value are given below.
2Cr2+(aq) + Co2+(aq)? 2 Cr3+(aq) + Co(s) K = 2.79 * 10^7

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