The effect of changing the concentration of reactants and products on the rate of a chemical equilibrium reaction can be explained using Le Chatelier's principle. According to this principle, if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will adjust its equilibrium position to counteract the change.When the concentration of reactants is increased, the equilibrium will shift towards the products to counteract the increase in reactant concentration. This results in an increase in the rate of the forward reaction and a decrease in the rate of the reverse reaction. Conversely, if the concentration of products is increased, the equilibrium will shift towards the reactants, increasing the rate of the reverse reaction and decreasing the rate of the forward reaction.To experimentally determine the effect of changing concentrations on the rate of a chemical equilibrium reaction, a simple apparatus can be set up as follows:1. Choose a suitable reversible reaction with easily measurable properties, such as a change in color or the formation of a precipitate. For example, the reaction between iron III nitrate and potassium thiocyanate, which produces a red-colored iron III thiocyanate complex, can be used.2. Prepare a series of test tubes containing different initial concentrations of the reactants, while keeping the total volume constant. For instance, you can prepare test tubes with varying concentrations of iron III nitrate and a constant concentration of potassium thiocyanate.3. Mix the reactants in each test tube and allow the system to reach equilibrium. The equilibrium can be assumed to be reached when there is no further change in the observable property e.g., color intensity .4. Measure the observable property e.g., color intensity of each test tube using a colorimeter or spectrophotometer. This will give you a quantitative measure of the equilibrium concentration of the product.5. Plot the equilibrium concentration of the product against the initial concentration of the reactants. This will help you visualize the effect of changing the concentration of reactants on the rate of the chemical equilibrium reaction.By analyzing the results, you can determine how the rate of the chemical equilibrium reaction is affected by the change in the concentration of reactants and products.