RATE LAW: (Law of Mass Action)

by • 27/08/2013 • GeneralComments (0)336

RATE LAW: (Law of Mass Action)

According to the rate law:

The rate of a chemical reaction is directly proportional to the concentration of reactants.

MATHEMATICAL FORM:

Consider the following reaction:

A + B ———-> C

Now

dx/dt α [A] ———–i

dx/dt α [B] ———–ii

 

By combining

dx/dt α [A] [B]

dx/dt = (constant) [A] [B]

dx/dt = K[A] [B]

In general

dx/dt = K[Reactants]

Here

dx/dt = Rate of reaction

K = Rate constant

 

CHARACTERISTICS OF RATE CONSTANT:

1. Rate constant does not depend upon concentration of Reactants.

2. Rate constant depends upon temperature.

3. Rate constant changes by change in temperature.

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