Changing the concentration of one of the reactants in the reaction between potassium permanganate KMnO4 and hydrogen peroxide H2O2 in acidic solution will affect both the rate and sustainability of the reaction. This reaction can be represented by the following balanced equation:2 KMnO4 + 5 H2O2 + 6 H+ 2 Mn2+ + 5 O2 + 8 H2OThe rate of a chemical reaction is influenced by the concentration of the reactants, according to the rate law. In this case, the rate law can be expressed as:rate = k [KMnO4]^m [H2O2]^n [H+]^pwhere k is the rate constant, m, n, and p are the reaction orders with respect to KMnO4, H2O2, and H+ ions, respectively. The values of m, n, and p are determined experimentally.If the concentration of one of the reactants e.g., KMnO4 is increased, the rate of the reaction will also increase, assuming that the reaction orders are positive. This is because there will be more reactant particles available to collide and react with each other, leading to a faster reaction rate. Conversely, if the concentration of one of the reactants is decreased, the rate of the reaction will decrease.As for the sustainability of the reaction, it refers to the ability of the reaction to continue until one of the reactants is completely consumed. If the concentration of one of the reactants is significantly higher than the other, the reaction will continue until the limiting reactant is used up. At this point, the reaction will stop, and the excess reactant will remain unreacted. Therefore, changing the concentration of one of the reactants can affect the sustainability of the reaction by altering the amount of product formed and the extent to which the reaction proceeds.In summary, changing the concentration of one of the reactants in the reaction between potassium permanganate and hydrogen peroxide in acidic solution will affect both the rate and sustainability of the reaction. Increasing the concentration of a reactant will generally lead to a faster reaction rate, while the sustainability of the reaction will depend on the relative concentrations of the reactants and the limiting reactant.