The reaction between hydrochloric acid HCl and magnesium ribbon Mg can be represented by the following balanced chemical equation:Mg s + 2 HCl aq MgCl2 aq + H2 g In this reaction, magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. The reaction rate is influenced by several factors, including the concentration of the reactants, temperature, and pH.The pH of a solution is a measure of the concentration of hydrogen ions H+ in the solution. In the case of hydrochloric acid, a strong acid, the pH is directly related to the concentration of HCl. A lower pH indicates a higher concentration of HCl, while a higher pH indicates a lower concentration of HCl.The reaction rate between hydrochloric acid and magnesium ribbon is directly proportional to the concentration of HCl. As the concentration of HCl increases lower pH , the reaction rate increases, and as the concentration of HCl decreases higher pH , the reaction rate decreases.This relationship can be explained by the collision theory, which states that the reaction rate is proportional to the frequency of effective collisions between reactant molecules. When the concentration of HCl is higher lower pH , there are more H+ ions available to react with magnesium atoms, leading to more frequent effective collisions and a faster reaction rate. Conversely, when the concentration of HCl is lower higher pH , there are fewer H+ ions available to react with magnesium atoms, leading to less frequent effective collisions and a slower reaction rate.In summary, the change in pH affects the reaction rate of the reaction between hydrochloric acid and magnesium ribbon by influencing the concentration of HCl. A lower pH higher HCl concentration results in a faster reaction rate, while a higher pH lower HCl concentration results in a slower reaction rate.