difference between d/dt rate and the K rate..plzzz Share with your friends Share 0 Vartika Jain answered this Dear Student, ddt is the rate of reaction.For eg. if A is the reactantA → ProductThen, Rate d=dt[A]and, k is the rate constant of a reaction. also, rate = k[A]This is the intergrated rate law. Rate can be calculated from any of the method, both are correct. 1 View Full Answer