In this section, we will learn about the pseudo-first-order reaction and their rate equations. To begin with, reactions that appear to be second order in nature but are approximated as a first-order of reaction on close analysis. For a zero order reaction, as shown in the following figure, the plot of a versus time is a straight line with k - slope of the line. Other graphs are curved for a zero order reaction.
This type of reaction is known as a pseudo first order reaction. Yes, a reaction whose order of reaction is actually more than one can 'fake' being a first order reaction. It is a curved graph which indicates that the rate of the reaction is changed with concentration of the reactant. The graph with white colored points shows the graph of lnreactant concentration vs. B write the rate law for the reaction.
Compare the graphs with those in figure 14. In the above diagram, the graph with dark points is the graph of reactant concentration vs. In the above example, the order of the reaction is 1 although the stoichiometric coefficient is. Using the appropriate data from the table and the linear graph corresponding to the rate law for the reaction, calculate the slope of the plotted line to obtain the rate constant for the reaction.
The rate of the first order reaction can be shown in a graph as below.