The rate of a chemical reaction is affected by several factors, including the concentration of the reactants. In the case of the reaction between magnesium ribbon and hydrochloric acid, the reaction can be represented by the following balanced equation:Mg s + 2HCl aq MgCl2 aq + H2 g As the concentration of hydrochloric acid HCl is increased, the rate of reaction between magnesium and hydrochloric acid also increases. This is because a higher concentration of HCl means that there are more HCl molecules in the solution, which increases the likelihood of successful collisions between the magnesium and HCl molecules. As a result, the reaction occurs at a faster rate.In summary, increasing the concentration of hydrochloric acid in the reaction with magnesium ribbon leads to an increase in the rate of reaction. This is due to the higher probability of successful collisions between the reactant molecules, which allows the reaction to proceed more quickly.