The reaction between hydrochloric acid HCl and magnesium Mg can be represented by the following balanced chemical equation:Mg s + 2 HCl aq MgCl2 aq + H2 g In this reaction, magnesium metal reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. The rate of this reaction can be affected by various factors, including the concentration of the reactants, temperature, and pH level.The pH level of a solution is a measure of its acidity or alkalinity. In the case of hydrochloric acid, a lower pH indicates a higher concentration of HCl, while a higher pH indicates a lower concentration of HCl. Since the reaction between HCl and Mg depends on the concentration of HCl, varying the pH levels will have an effect on the rate of the reaction.At lower pH levels higher HCl concentration , the rate of the reaction will generally be faster. This is because there are more HCl molecules available to react with the magnesium, leading to a higher frequency of successful collisions between the reactant particles. As a result, the reaction will proceed more quickly, and the products MgCl2 and H2 will be formed at a faster rate.At higher pH levels lower HCl concentration , the rate of the reaction will generally be slower. This is because there are fewer HCl molecules available to react with the magnesium, leading to a lower frequency of successful collisions between the reactant particles. As a result, the reaction will proceed more slowly, and the products MgCl2 and H2 will be formed at a slower rate.In summary, varying the pH levels of the hydrochloric acid solution will have a direct impact on the rate of the reaction between HCl and Mg. Lower pH levels higher HCl concentration will result in a faster reaction rate, while higher pH levels lower HCl concentration will result in a slower reaction rate.