What are the effects of cations on the chemical equilibrium between Prussian Blue and Prussian White at an electrode surface? How can this effect be exploited to develop potentiometric cation sensors?...

What are the effects of cations on the chemical equilibrium between Prussian Blue and Prussian White at an electrode surface? How can this effect be exploited to develop potentiometric cation sensors? Write the Nernst equation for the electrochemical reaction (13.97) and determine the theoretical sensitivity of a potentiometric potassium sensor based on this reaction.