The Kp can be used to predict the direction of a reaction by comparing the Kp value to the initial concentrations of reactants and products. If the Kp is greater than 1, the reaction will proceed to the right, favoring the formation of products. If the Kp is less than 1, the reaction will proceed to the left, favoring the formation of reactants. If the Kp is equal to 1, the reaction is at equilibrium and the concentration of reactants and products will not change.