Write the Nernst equation² at 298 K for a redox reaction.
Consider the following 11 values of reaction quotient Q
0.0200, 0.0600, 0.100, 0.300, 0.600, 1.00, 15.0, 40.0, 60.0, 80.0, 100.
Calculate $E_{cell}$ and $\frac{E_{cell}-E_{cell}^{o}}{(RT/vF)}$ for each value of Q and make a table for that.
Plot $\frac{E_{cell}-E_{cell}^{o}}{(RT/vF)}$ vs log Q. Recall that RT/F = 0.0257 V at 25°C.
What is the effect of Q (that is the activity) on $\frac{E_{cell}-E_{cell}^{o}}{(RT/vF)}$? Is the effect the same at higher
and lower values of Q? what is the largest value of the absolute difference between cell
potential and standard cell potential, $|E_{cell} - E_{cell}^{o}|$? What do you expect the graph will
look like for different number of electron transferred (v)
¹Atkins' Physical Chemistry, Atkins and de Paula, 10th Ed., 2014, OUP, pp. 226-228.
²Atkins' Physical Chemistry, Atkins and de Paula, 10th Ed., 2014, OUP, pp. 262-264.
Fill in the following in your answer sheets
Redox reaction:
$E_{cell}^{o}$ = , v =
Q $E_{cell}$ (V) log Q $\frac{E_{cell} - E_{cell}^{o}}{(0.0257\ V/v)}$ $|E_{cell} - E_{cell}^{o}|$ (V)