How to find the order of a reaction when rate constant is not given?
When rate constant is not given then we can find the order of reaction through graphical method.By plotting a graph of values obtained of concentration vs time.
Order of a reaction is always determined experimentally on the basis of dependence of rate of reaction on concentration of reacting species. In order to determine this dependence, we have to find how the concentration of various reacting species vary during the reaction. For example, a known volume of the reaction mixture may be taken out during different time intervals, and then the concentration of reactant can be determined by volumetric titration or any other analytical technique. We can also determine this by change in the conductivities or the specific rotation.
The rate law equation for respective order of reaction are :
Graphs obtained are as follows :
Order of a reaction is always determined experimentally on the basis of dependence of rate of reaction on concentration of reacting species. In order to determine this dependence, we have to find how the concentration of various reacting species vary during the reaction. For example, a known volume of the reaction mixture may be taken out during different time intervals, and then the concentration of reactant can be determined by volumetric titration or any other analytical technique. We can also determine this by change in the conductivities or the specific rotation.
The rate law equation for respective order of reaction are :
Graphs obtained are as follows :