Two temperature determination
of Ea
At temp T1 ln (k at T1) = ln A - Ea / RT1
At temp T2 ln (k at T2) = ln A - Ea / RT2
Subtract:
ln (k at T1)
- ln (k at T2) = - Ea ( 1 - 1 )
R ( T1 T2 )
Or ln [(k at T1) / (k at T2)] = - Ea ( 1 - 1 )
R ( T1 T2 )
Knowing k at a particular
temperature, and Ea
enables calculation of k at any other temperature