Sodium Thiosulphate And Hydrochloric Acid Lab Report

The first step that needed to be done in this experiment was adding hydrochloric acid (HCl)

How concentration affects the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate Chemistry Coursework How Concentration Affects a Reaction Aim: The aim of this experiment is to find out how concentration affects the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate. Introduction: This experiment will be carried out by drawing a cross on a piece of paper and mixing hydrochloric acid and sodium thiosulphate together to see if the cross disappears. The concentration of hydrochloric acid would change every reaction to show that concentration effects a reaction.

The rate of reaction will be measured by timing how long it takes for the spheres of yeast to sink and float up to the top again.

The aim of the experiment will be to investigate how varying water temperatures influence the time of a chemical reaction, in this case being, a combination of Sodium Thiosulfate and Hydrochloric Acid.

The reaction will be complete after approximately 60 seconds. Observe where color develops, and consider what these results indicate. Record your results in Table 1.

The hypothesis tested in this experiment was, if the temperature of enzyme catalysis were increased, then the reaction rate would increase, because enzyme-catalysis reacts by randomly colliding with substrate molecules, and the increase in temperature increases the speed of collision or reaction rate. The final data collected for the experiment was positive with my hypothesis. The coffee filter, covered in potato solution, sank and rose at a faster pace in the hydrogen peroxide when the temperatures were raised.

After the twenty minutes elapsed, the flask was cooled to room temperature and then titrated with the remaining NaOH until the colorless solution remained pink. The final volume was then recorded. While solution #1 was heating the same process was repeated with solution#2 and the second burette

Table 2: Consists of color extract taken from a red cabbage for a natural indicator. The pH reading that was measured by using the pH meter and the result of the pH reading to determine whether the solution was acidic or basic.

The next step in this lab is to rinse the Erlenmeyer flask with distilled water down the drain and then repeat the experiment, this time adding 10 ml of 0.10M KI and 10 ml of distilled water to the flask instead. The flask should again be swirling to allow the solution to succumb to the same temperature as the water bath and once it has reached the same temperature, 10 ml of 3% H2O2 must then be added and a stopper must be immediately placed on the flask and recording should then begin for experiment two. After recording the times, the Erlenmeyer flask must then be rinsed again with distilled water down the drain. After rinsing the flask, the last part of the lab can now be performed. Experiment three is performed the same way, but instead, 20 ml of 0.10 ml M KI and 5 ml of distilled water will be added and after the swirling of the flask, 5 ml of 3% H2O2 will be added. After the times have been recorded, data collection should now be complete.

This means that substances that absorb more hydrogen ions will produce faster reactions times due to higher temperatures. The data obtained from this experiment did not support the claim hypothesized. In the hypothesis it was stated that the acidic solution would produce the fastest reaction time. At the end of the completed experiment it was discovered that the basic solution produced the fastest reaction time of 60.771 seconds, while the acidic solutions reaction time was 65.971 seconds, and the neutral solution produced a 63.425 reaction time. Some potential problems that could have arouse during this experiment were that not all beakers contained the same amount of substance. Since the liquids were measured with the naked eye there is a chance that amount of solutions in each beaker were different. Another potential issue could have been not allowing all of the antacid tablet to dissolve before stopping the timer. This issue much like the one stated before would be hard to tell by just looking at the experiment with a naked eye. Perhaps in another experiment looking to test pH and reaction times an experimenter should take solutions ranging across the pH scale and change the temperature of each substance to see how temperature can affect the reaction

Stoichiometry is a method scientists use to presume how two or more substances will react together. In order to do so successfully, the reactants are positioned on the left and the products on the right. The most important part of successfully

* Size- If one of the reactants is a solid it will have a smaller

To keep this a fair test I have made sure that the acid used is the

8.After 5 minutes, remove test tubes from the water bath set in test tube holder and record results. Also turn off hot plate.

To find out what happens to a subject’s reaction time when different independent variables are applied.