How to calculate standard reduction potential? I am doing an online chem lab and

Question

How to calculate standard reduction potential?

I am doing an online chem lab and it is asking for the Standard reduction potential based on values obtained from a potentiometry experiment.

I'm not 100 percent how to do this. Please assist.

1.) Standard reduction potential Cu(s)

Recorded data

oxidized at the anode. The oxidation half-reaction is: Rewriting this as a reduction half-reaction gives: At the cathode of this cell, Cu2+ is reduced to Cu metal, with a reduction half-reaction of: In order to calculate the cell potential, we can subtract the the potential for reaction (lb) from the potential for reaction (2): The potentials given are all half-reaction potentials under standard conditions, that is, where ions in solution are present at 1 M concentrations, gaseous reactants are at 1 atm pressure, and the cell temperature is 25 degree C. Note that all of the half-reaction potentials used in this experiment are relative to a standard hydrogen electrode (SHE), which is assigned a potential of 0.00 V.

Explanation / Answer

Zn has reduction potential of -0.76 V , Cu has reduction potential of + 0.34 V ,

since Zn lies above Cu in reactivity series for metals ,

so Zn will undergo oxidation and Cu will undergo reduction..Zn acts as anode and Cu as cathode

E0 cell = E0 (cathode) - E0 (anode) = +0.34 - (-0.76) = 0.34 + 0.76 = 1.1 V (answer)

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