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how to determine order of a reaction?tell me in detail.

```
7 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear shamshad,

Orders of  reaction are always found by doing experiments.  You can't deduce  anything about the order of a reaction just by looking at the equation  for the reaction.
So let's suppose that you have done some experiments to find out what  happens to the rate of a reaction as the concentration of one of the  reactants, A, changes.  Some of the simple things that you might find are:
One possibility:  The rate of reaction is proportional to the concentration of A
That means that if you double the concentration of A, the rate doubles as well.  If you increase the concentration of A by a factor of 4, the rate goes up 4 times as well.
You can express this using symbols as:

Writing a formula in square brackets is a standard way of showing a concentration measured in moles per cubic decimetre (litre).
You can also write this by getting rid of the proportionality sign and introducing a constant, k.

Another possibility:  The rate of reaction is proportional to the square of the concentration of A
This means that if you doubled the concentration of A, the rate would go up 4 times (22).  If you tripled the concentration of A, the rate would increase 9 times (32).  In symbol terms:

Generalising this
By doing experiments involving a reaction between A and B, you would find that the rate of the reaction was related to the concentrations of A and B in this way:

This is called the rate equation for the reaction.
The concentrations of  A and B have to be raised to some power to  show how they affect the rate of the reaction.  These powers are called the orders of reaction with respect to A and B.

We are all  IITians and here to help you in your IIT  JEE preparation.  All the best.
Sagar Singh
B.Tech IIT Delhi

```
7 years ago
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