When trying to increase the value of Kc for an exothermic reaction, should the temperature be increased or decreased? :/
Kc is products over reactants. to increase the value of Kc we need o increase the products. For a reaction where the forward reaction is endothermic (what you said) and increase in temp would favor the backward reaction, this will increase the reactants and lower Kc.....a decrease in temp would favor the forward reaction, so products will increase and so will Kc. Hence a decrease in temp is the answer to your question.