And we said that rate law is a mathematical representation between the relationship of the concentration of reactants and our reaction rates. Now, we also said that rate law can only be determined using experimental results. And that's exactly right. Now, in this lecture, we're going to look at the following form reaction and try to determine our rate law using some experimental data. So let's begin. 1 mol of methyl acetate react with 1 mol of hydroxide to produce 1 mol of acetate ion and 1 mol of methanol.