Rate Of Reaction

The change in the concentration of any one of either reactants or products of the chemical reaction is commonly known as the rate of that particular reaction. Units of the rate of a reaction are mol/Ls or M/s or atm/time units.

Rate Constant

We can define the Rate constant as the rate of reaction at a specific time when the molecular concentration of the reactants is taken as unity. For example, for a chemical reaction, A + B ——> AB,

Rate = K[A][B]

where, 

  • [A] is the concentration of A,
  • [B] is the concentration of B.

Units of the rate constant are K = (1/Time) * (1/[Conc.]n-1).

Pseudo First Order Reaction

Pseudo means fake or false. A pseudo-first-order reaction is defined as a reaction that appears like a higher order reaction but is actually of a lower order. A pseudo-first-order reaction is a bimolecular reaction that appears like a first order (1st order) reaction due to more concentration of reactants than the other reactants. But, it is different from the first-order reaction. In this article, we are going to learn about the pseudo-first-order reaction. We can determine the order of the reaction by the dependency of the reaction rate on reactants concentration. We can say an order is a first-order reaction if the rate of reaction is directly proportional to the first power of concentration of the reactants. The order of the pseudo-first-order reaction is defined as the sum of the powers of concentration of reactants in the rate law expression, which is also known as the order of that particular chemical reaction. We can classify the order of the reactions as a first-order reaction, second-order reaction, zero-order reaction, or pseudo-first-order reaction depending on the reactants’ concentration.

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