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The rate law is an expression for the reaction rate in terms of concentrations of chemical species involved in the reaction. For example, Rate = k [A]m [B]n. where k is a rate constant, m is reaction order with respect to A, n is the reaction order with respect to B, and m+n is the overall reaction order. The rate constant is independent of the concentrations of the chemical species involved in the reaction.
Its value depends on the nature of the substances and the temperature. Each concentration is raised to a power. The value of the power is called the order of the reaction for each reactant. For example, if x and y were found to each equal 1, then the rate law for the reaction would be: rate = k[A][B].he quantitative relationship between the concentrations of substances in a reaction, and the rate of a reaction, is called the rate law for a reaction. If the generic reaction used here had a typical and simple rate law, it would be:rate = k[A] x [B] y k is called the rate constant.