OCR Advanced GCE in Chemistry/Electrode potentials/What?

There could be a question that will ask if a reaction is feasible in the opposite direction to the way that you would expect it to go from the EO values. For this, all you have to do is show the calculation in the same way as usual but make the EO value negative. This shows that the reaction is going in the other way. Because the reaction is not feasible, the value will be negative.