The reaction between sodium thiosulfate Na2S2O3 and hydrochloric acid HCl is a well-known reaction in chemistry, which can be represented by the following balanced equation:Na2S2O3 aq + 2HCl aq 2NaCl aq + H2O l + SO2 g + S s The rate of this reaction can be affected by various factors, including the concentration of the reactants and the temperature at which the reaction takes place. Let's discuss the effect of each factor:1. Effect of concentration:According to the collision theory, the rate of a reaction depends on the frequency of effective collisions between the reacting particles. When the concentration of the reactants is increased, the number of particles per unit volume also increases. This leads to a higher probability of effective collisions between the reactant particles, resulting in an increased reaction rate.In the case of the reaction between sodium thiosulfate and hydrochloric acid, increasing the concentration of either Na2S2O3 or HCl will increase the rate of the reaction. This is because more reactant particles are available to collide and react with each other, leading to a faster formation of products.2. Effect of temperature:The rate of a chemical reaction is also affected by temperature. As the temperature increases, the kinetic energy of the reacting particles increases, causing them to move faster. This results in a higher frequency of effective collisions between the reactant particles, leading to an increased reaction rate.For the reaction between sodium thiosulfate and hydrochloric acid, increasing the temperature will increase the rate of the reaction. This is because the reactant particles have more energy to overcome the activation energy barrier, leading to a faster formation of products.In summary, both increasing the concentration of the reactants and increasing the temperature will lead to an increased rate of the reaction between sodium thiosulfate and hydrochloric acid. This is due to the higher probability of effective collisions between reactant particles and the increased kinetic energy of the particles, respectively.