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Date: 30-9-2018
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Date: 25-9-2018
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Temperature Dependence of Rate Constants
Rate constants, like equilibrium constants, are temperature-dependent. Unlike K, however, k virtually always increases with increasing temperature. The temperature-dependence usually obeys the Arrhenius equation,
(1.1)
where A is called the frequency factor and Ea is the activation energy. The logarithmic form of the Arrhenius equation,
the same form as eq (1.2) for In K, with Ea replacing DH° and In A replacing DS°/R.
(1.2)
Comparing rate constants measured at two different temperatures, we can derive the analog of Eq. (1.2):
(1.3)
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