The concentration of reactants plays a significant role in the rate of a chemical reaction and the overall yield of the product. In the specific reaction between potassium iodide KI and hydrogen peroxide H2O2 , the reaction can be represented by the following equation:2 KI aq + H2O2 aq 2 KI aq + 2 H2O l + O2 g The rate of this reaction is affected by the concentration of both KI and H2O2. According to the collision theory, increasing the concentration of reactants increases the number of particles in the solution, leading to a higher probability of collisions between the reacting particles. As a result, the rate of the reaction increases.In terms of the overall yield of the product, the reaction between KI and H2O2 is a stoichiometric reaction, meaning that the amount of product formed depends on the limiting reactant. If one of the reactants is present in excess, the reaction will continue until the limiting reactant is completely consumed. The overall yield of the product will be determined by the amount of the limiting reactant.For example, if the concentration of KI is much higher than that of H2O2, the reaction will proceed until all the H2O2 is consumed, and the overall yield of the product will be limited by the amount of H2O2 present. Conversely, if the concentration of H2O2 is much higher than that of KI, the reaction will proceed until all the KI is consumed, and the overall yield of the product will be limited by the amount of KI present.In summary, the concentration of reactants affects the rate of the chemical reaction between potassium iodide and hydrogen peroxide by increasing the probability of collisions between reacting particles. The overall yield of the product is determined by the amount of the limiting reactant, which depends on the initial concentrations of both KI and H2O2.