# What is Pseudo First Order Reaction? Give One· Example of It. - Chemistry

What is pseudo first order reaction? Give one· example of it.

#### Solution

A reaction which has higher order true rate law but experimentally found to behave as first order are called  pseudo first order reaction.

e.g. C_12H_22O_(11(aq))+H_2OrarrC_6H_12O_6+C_6H_12O_6

Sucrose                       Glucose       fractose

is an example of pseudo first order reaction, because water takes part in the reaction the true rate law

rate = k'[C12H22O11][H2O]

indicates that the reaction must be second order. Similarly to the hydrolysis of ester,[H2O] is constant and
the rate law became

rate=k[C12H22O11]

Thus, the second order true law is converted, to first order rate law.

Concept: Factors Influencing Rate of a Reaction
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