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9 years ago

Dear **Rashmi V**,

The main difference between a First Order Reaction & a Pseudo First Order reaction is that the Pseudo first order eaction is a reaction that should actually happen by some higher order(higher than 1) but occurs by first order beacuse the concentration of one reactant used is very high & another reactant used is very low ...

The concentration of the reactant which is very low can be negleted & thus the concentration of the reactant which has higher concentration is alone taken !

This makes the reaction follow a first order kinetics rather than some higher order.This is Pseudo First order reaction !

Hope you understood now..

All the Best & Good Luck !

**Please approve my answer if you liked it by clicking on "Yes" given below...!!**

9 years ago

**Pseudo First Order Reaction**

**A** and **B** react to produce **P**:

If the initial concentration of the reactant **A** is much larger than the concentration of **B**, the concentration of **A** will not change appreciably during the course of the reaction The concentration of the reactant in excess will remain almost constant. Thus the rate's dependence on **B** can be isolated and the rate law can be written

Equation **(1)** represents the differential form of the rate law. Integration of this equation and evaluation of the integration constant **C** produces the corresponding integrated law.

Substituting **[ B ] = c** into equation **(1)** yields

Integrating equation **(2)** gives: The constant of integration **C** can be evaluated by using boundary conditions. At **t = 0**, the concentration of **B** is **c _{o}**.

Therefore Accordingly, equation

If the decrease in concentration of

Combining equation

A = Absorbance, e = Molar absorbtivity with units of L

c = Concentration of the absorbing species in solution, expressed in mol

I

gives the relationship between

According to equation

The

Measuring a

9 months ago

Dear student,

The main difference between a First Order Reaction & a Pseudo First Order reaction is that the Pseudo first order eaction is a reaction that should actually happen by some higher order(higher than 1) but occurs by first order beacuse the concentration of one reactant used is very high & another reactant used is very low ...

The concentration of the reactant which is very low can be negleted & thus the concentration of the reactant which has higher concentration is alone taken !

This makes the reaction follow a first order kinetics rather than some higher order.This is Pseudo First order reaction!

Hope this helps.

Thanks and regards,

Kushagra

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