Concentration cell product

[Ashley McClearnen 1B]

In a concentration cell, why do you have to make the lower concentration the product?

[Chloe Qiao 4C]

In a concentration cell, the half cell with higher concentration initially will be the cathode side and the one with lower initial concentration will be the anode side. As the reaction proceed, electrons transfer from the anode side to the cathode side, lowering the substance concentration in the cathode half cell until it matches the initial concentration of the anode side. You can see it as only considering the cathode half cell, in which a higher concentration is reduced to a lower one.