Answer the following in brief. How will you determine activation energy graphically using the Arrhenius equation? - Chemistry

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Answer in Brief

Answer the following in brief.

How will you determine activation energy graphically using the Arrhenius equation?

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Solution

Graphical representation of activation energy

Arrhenius equation is `"k" = "Ae"^((-"E"_"a")/("RT"))`

Taking the logarithm of both sides of Eqn. we obtain

In k = -`"E"_"a"/"RT" + "In A"`

Converting the natural base to base 10 we write

This equation is of the form of straight-line y = mx + c.

The Arrhenius plot of log10k versus `1/"T"` gives a straight line as shown in the diagram. A slope of the line is `-"E"_"a"/(2.303 "R")` with its intercept being log10A.

From a slope of the line, the activation energy can be determined.

Variation of log10k with 1/T

Concept: Temperature Dependence of Reaction Rates
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Chapter 6: Chemical Kinetics - Exercises [Page 137]

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Balbharati Chemistry 12th Standard HSC for Maharashtra State Board
Chapter 6 Chemical Kinetics
Exercises | Q 3.14 | Page 137
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