Changing the concentration of reactants affects the position of the equilibrium, but not the equilibrium constant K of a chemical reaction. The equilibrium constant is a ratio of the concentrations of products to reactants, raised to their respective stoichiometric coefficients, at equilibrium. It is important to note that the equilibrium constant is only affected by temperature changes.However, changing the concentration of reactants can shift the position of the equilibrium, either towards the products right or the reactants left , according to Le Chatelier's principle. This principle states that if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will adjust its position to counteract the change and re-establish equilibrium.To quantitatively measure the effect of changing reactant concentrations on the position of the equilibrium, you can perform experiments and collect data. Here's a general outline of the process:1. Choose a chemical reaction with a known equilibrium constant K and prepare a series of reaction mixtures with varying initial concentrations of reactants.2. Allow each reaction mixture to reach equilibrium. This can be determined by monitoring the reaction until the concentrations of reactants and products remain constant.3. Measure the equilibrium concentrations of reactants and products using appropriate analytical techniques, such as spectrophotometry, chromatography, or titration.4. Calculate the reaction quotient Q for each experimental condition using the measured equilibrium concentrations. The reaction quotient is similar to the equilibrium constant, but it is calculated using the actual concentrations of reactants and products at any given time, not just at equilibrium.5. Compare the calculated Q values to the known K value. If Q > K, the reaction will shift towards the reactants left to re-establish equilibrium. If Q < K, the reaction will shift towards the products right to re-establish equilibrium. If Q = K, the system is already at equilibrium.6. Analyze the data to determine how the initial reactant concentrations affected the position of the equilibrium. This can be done by plotting the initial concentrations against the equilibrium concentrations or by calculating the percentage change in concentrations.In summary, while changing the concentration of reactants does not affect the equilibrium constant, it does affect the position of the equilibrium. By performing experiments and analyzing the data, you can quantitatively measure the effect of changing reactant concentrations on the position of the equilibrium.