![]() ![]() excess reactant - the concentration of excess reactant is treated as constant since the change in the amount of excess reactant is negligible as the reaction proceeds.ī. Once we suspect the question is about pseudo first order reaction we can verify this by looking out for one of these criteria:Ī. That's where the concept of pseudo first order reaction comes in. This means that the question is hinting to us that in order for us to determine half life for a second order reaction, we need to change this reaction into a first order reaction. In fact, in A Level Chemistry syllabus we are only required to find half life for first order reactions. The overall order of the reaction is 2, which makes it difficult for us to determine half life as we know that half life is not constant for overall order 2 reaction. Since order is 1 with respect to both reactants then the rate equation is given as: ![]() Let's first write down the rate equation based on the order of the reaction with respect to A and B. What is the new half life when the concentration of B is changed to 1.00 moldm -3? 1. ![]() Given a reaction is first order with respect to both reactants A and B.įor an experiment, where = 0.01 moldm -3 and = 0.50 moldm -3, the half life was determined to be 10 minutes. In this video we want to discuss the concept of Pseudo first order reaction in Kinetics. ![]()
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