Changing the concentration of a catalyst affects the rate of the catalyzed reaction, but the relationship is not always linear. Catalysts work by lowering the activation energy of a reaction, allowing it to proceed more quickly. However, the effect of catalyst concentration on reaction rate depends on the specific reaction and catalyst involved.To demonstrate the effect of catalyst concentration on reaction rate, let's consider the decomposition of hydrogen peroxide H2O2 catalyzed by potassium iodide KI .Experimental data:In an experiment, different concentrations of KI are used to catalyze the decomposition of hydrogen peroxide. The rate of the reaction is measured by monitoring the volume of oxygen gas O2 produced over time.The following data is obtained:1. 0.1 M KI: Reaction rate = 0.02 mol/L/min2. 0.2 M KI: Reaction rate = 0.04 mol/L/min3. 0.3 M KI: Reaction rate = 0.06 mol/L/min4. 0.4 M KI: Reaction rate = 0.08 mol/L/min5. 0.5 M KI: Reaction rate = 0.10 mol/L/minFrom this data, we can see that the reaction rate increases linearly with the concentration of the KI catalyst. However, it is essential to note that this linear relationship may not hold true for all reactions and catalysts. In some cases, the reaction rate may increase initially with catalyst concentration but then level off as the reaction becomes saturated with the catalyst.In conclusion, changing the concentration of a catalyst can affect the rate of the catalyzed reaction, but the relationship between the two depends on the specific reaction and catalyst involved. In the example provided, the reaction rate increased linearly with the concentration of the KI catalyst.