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Dependence of Rate on Reactant Concentrations: Rate Law and Rate Constant

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Rate Law and Rate Constant

Rate Law Expression:

The rate law (or rate expression) gives the experimental relationship between reaction rate and the molar concentration of reactants:

For aA + bB → Products: Rate = k[A]x[B]y
  • x and y are the orders with respect to A and B, respectively — they may or may not equal stoichiometric coefficients a and b.
  • k is the rate constant (specific reaction rate).

Characteristics of Rate Constant (k):

  • Higher value of k → greater rate.
  • Depends on temperature and catalyst only.
  • Does not depend on initial concentrations, volume, or pressure.
  • Its units depend on the overall order of reaction.
 
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