Sketch a diagram of the cell that would be formed by connecting the two half-cel

Question

Sketch a diagram of the cell that would be formed by connecting the two half-cells in Question 2(a). Which half-cell should be connecting to the negative terminal of the voltmeter, and which to the negative terminal? Briefly explain. Explain electron flow in the external wires and ion flow the solution of this cell. Calculate the cell potential and show the equation for the overall redox reaction. When you multiply the equation for a half-reaction by a factor before combining it with another half-equation, why don't you multiply the EMF for the half-reaction by the same factors? Briefly explain. A cell Sn/Sn(IV) ion -Ni/Ni (II) ion will have electromotive force.

Explanation / Answer

Q4.

Yes., they will have a electromotive force, since there is a difference in cell potentials

so:

Sn4+ + 2 e Sn2+ +0.15

Ni2+ + 2 e Ni(s) 0.25

so

E = Ecat - Eanod = 0.15 - (-0.25) = 0.40 V

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