The effect of temperature on the rate of the reaction between hydrochloric acid HCl and sodium thiosulfate Na2S2O3 can be explained using the collision theory. As the temperature increases, the kinetic energy of the particles also increases, leading to more frequent and effective collisions between the reactant particles. This results in an increased rate of reaction.Experimental evidence:To investigate the effect of temperature on the rate of the reaction between hydrochloric acid and sodium thiosulfate, you can perform an experiment using the following procedure:1. Prepare a series of water baths at different temperatures e.g., 10C, 20C, 30C, 40C, and 50C using a thermostatic water bath or ice and hot water.2. Measure a fixed volume of sodium thiosulfate solution e.g., 10 mL and hydrochloric acid solution e.g., 5 mL using separate graduated cylinders or pipettes.3. Place the sodium thiosulfate solution in a conical flask and put it in the water bath at the desired temperature. Allow the solution to equilibrate to the water bath temperature for a few minutes.4. Add a few drops of a starch indicator to the sodium thiosulfate solution. This will help to determine the endpoint of the reaction, as the solution will turn from colorless to a blue-black color when the reaction is complete.5. Add the hydrochloric acid solution to the sodium thiosulfate solution and immediately start a stopwatch.6. Observe the reaction and stop the stopwatch when the blue-black color appears, indicating the endpoint of the reaction.7. Record the time taken for the reaction to complete at each temperature.8. Repeat the experiment for each temperature and calculate the average time taken for the reaction to complete.9. Plot a graph of the temperature x-axis against the inverse of the time taken 1/time y-axis . This will give a measure of the rate of reaction.The graph should show a positive correlation between temperature and the rate of reaction, indicating that the rate of reaction increases with increasing temperature. This experimental evidence supports the idea that temperature has a significant effect on the rate of the reaction between hydrochloric acid and sodium thiosulfate.