chemistry 12th class cbse notes

Half-Life of a Reaction

The half-life of a reaction is the time in which the concentration of a reactant is reduced to one half of its initial concentration.
Represented as: t1/2

  • For a zero order reaction, rate constant is given by equation.

Half-Life of zero order Reaction

  • For the first order reaction,

Half-Life of first order Reaction

Pseudo First-Order Reactions

Reactions which are not truly of the first order but under certain conditions become reactions of the first order.

Example:

Pseudo First-Order Reaction

Pseudo First-Order Reaction

The concentration of water does not get altered much during the course of the reaction. So, in the rate equation the term [H2O] can be taken as constant.

Pseudo First-Order Reaction

Pseudo First-Order Reaction

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