Arrhenius equation
Arrhenius presented the quantitative relationship among rate constant and temperature as,
.....(i)
The equation is termed as Arrhenius equation.
In which constant A is called as frequency factor. This specific factor is related to the number of binary molecular collision per second per litre.
Ea is activation energy.
T is absolute temperature and
R is gas constant
A and Ea both are collectively known as Arrhenius parameters.
By taking the logarithm equation (i) can be stated as,
.....(ii)
The activation energy Ea increases, the value of k decreases and hence, the reaction rate decreases.
When log k is plotted against 1/T, we obtain a straight line. The intercept of this specific line is equal to the log A and slope is equal to
.
Thus Ea=-2.303R*slope.
![2035_arrhenius equation3.png](https://www.expertsmind.com/../CMSImages/2035_arrhenius equation3.png)
The value of rate constants for the reaction at two different temperatures T1 and T2,
.....(iii)
Where k1 and k2 are rate constant at temperatures T1 and T2 respectively (T2>T1).
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