|Themes > Science > Chemistry > Inorganic Chemistry > Chemical Reaction , Chemical Formulas , Chemical Equation > Chemical Reaction > Chemical Kinetics > The Rate Law Versus the Stoichiometry of a Reaction|
They found that the rate of this reaction is proportional to the concentrations of both reactants.
Rate = k(CH3Br)(OH-)
When they ran a similar reaction on a slightly different starting material, they got similar products.
(CH3)3CBr(aq) + OH-(aq) (CH3)3COH(aq) + Br-(aq)
But now the rate of reaction was proportional to the concentration of only one of the reactants.
Rate = k((CH3)3CBr)
These results illustrate an important point: The rate law for a reaction cannot be predicted from the stoichiometry of the reaction; it must be determined experimentally. Sometimes, the rate law is consistent with what we expect from the stoichiometry of the reaction.
Often, however, it is not.