The order of reaction for each reactant is, in this case, determined by varying the concentrations of each reactant in turn while keeping the others constant. Only particles with enough energy to overcome the barrier will react after colliding. This reaction is usually carried out in a flask placed on a piece of white paper. Firstly, my results give conclusive evidence that as the amount of Sodium Thiosulphate decreases and the amount of water in the solution there are less atoms to collide and therefore less successful collisions causing chemical change so the reaction rate is slower. Lastly, I intend to take the investigation one step further by not only identifying the effects of change in concentration on the rate of reaction but also to study the rate of reaction itself.
Another thing we could have done to bring more evidence is to have tried to use the Hydrochloric acid as the variable substance, and used the Sodium Thiosulphate as the constant substance. Furthermore a colorimeter will be used to judge when the reaction has been completed. We should also try our best not to spill any chemicals, and we must not eat or drink in the lab while dealing with these harmful chemicals, as they can get on to our hands. My preliminary results also show that 5cm3 is a low enough concentration to begin with. Apart from this, the accuracy of my experiment has been more or less accurate. The phenolphthalein ion is pink… Introduction Acid-base titrations are used to calculate properties of an acid or a base by titrating them with a strong Acid or base. The reaction between sodium thiosulfate and hydrochloric acid, as illustrated in the following chemical equation, shows the formation of a solid sulfur precipitate.
The method of judging when the cross disappears will be changed, so the time taken to reaction can be recorded to a greater degree of accuracy. Lesson Summary In this lesson we learned that chemical reactions happen at different rates and can be altered to happen more quickly or more slowly. The rate of a reaction can be commonly explained by Collision Theory… Decomposition of sodium thiosulphate Aim: The aim or purpose of this investigation is to explain how concentration affects the rate of reaction the decomposition of sodium thiosulphate in reaction with hydrochloric. The Theory What is Chemical Kinetics? They are added within a mixture to encourage smooth boiling. The rate at which the solution turns cloudy demonstrates the speed at which the two compounds are reacting with each other. This can be justified by relating to the collision theory. The solid sulfur makes the colourless solution go cloudy.
In this investigation I will use the following word equation: Sodium Thiosulphate + Hydrochloric acid In this investigation I will use the following symbol equation:… 3099 Words 13 Pages Investigation How does the concentration of the sodium thiosulfate affect the rate of reaction to hydrochloric acid? The size of this activation energy is different for different reactions. Retrieved 6 February 2019, from amrita. Potassium dichromate oxidizes the iodide ion in acidic medium to equivalent amount of iodine. If they have more energy there is greater chances of successful collisions meaning the reaction occurs faster. In all the chemical reactions the reactants are consumed and new products are formed.
So the following procedure can be used to carry out the experiment. Remember the number of particles in chemistry is usually an extremely large number. The method was made reliable by: — Labelling all equipment to prevent contamination. Both of them have value of 2. The particles in solids, liquids… Phenolphthalein is often used as an indicator in acid base reactions. This classic experiment involves the reaction between sodium thiosulfate and hydrochloric acid, and teaches us much about reaction rates. Chemical Kinetics The study of chemical reaction rates is known as chemical kinetics.
Prediction: I predict that as the concentration of the Sodium Thiosulphate doubles, the rate of the reaction will double. This should involve a different method to obtain results E6b. Changing the concentration of the reactants is one way to alter the amount of particles present. The diagram below illustrates the set-up for this experiment: The Results In this experiment, as the concentration of thiosulfate is varied, the speed at which the 'X' disappears varies, indicating that changing concentration does indeed affect the rate of reaction. The aim of this experiment was to test if the temperature affects the rate of reaction between hypo and dilute hydrochloric acid? If you add more particles to that same amount of space the chances that those particles will collide increases and thus the chances of the reaction occurring increases. Because of the increase in the number of molecules, the number of collisions also increases as a result the rate of the reaction increases. Once the temperature has been recorded, we will get all the equipment needed ready to use.
It is measured by dividing 1 by the time taken for the reaction to take place. However, as the reaction proceeds, sulphur precipitates that make the solution more opaque and eventually the mark gets completely masked. What does the rate of a reaction mean? This report will investigate the processes involved in making superphosphate fertilizer, including the manufacture of sulfuric acid from sulfur using the contact process. But before we get into the experiment, we need to briefly go over some background. Before the reaction starts, the mark is clearly visible from the top of the conical flask through the solution.
In order to provide additional evidence for my conclusion, I intend to embark on several things. There are several types of titration methods in chemistry. These steps are to be repeated but the concentration of sodium thiosulphate will be varied. We are assuming that this is accurate. We must remember that the substances which we use in this experiment can be very harmful if used the wrong way.
In the beginning, both compounds are clear, but when mixed together they form a yellow precipitate — solid sulphur. So how do we increase the amount of particles in a reaction? Sodium thiosulphate reacts with dilute acid to produce sulphur dioxide, sulphur and water. The factors that affect the rate of reaction are: · Use of a catalyst · Temperature · Surface area · Concentration I will be investigating · Bags or any other obstructions should be removed. By referring to this graph it can be observed that the equivalence point is roughly at 7. At the beginning of the reaction, the cross can easily be seen through the solution in the flask.
We then recorded the time for the cross to become completely obscured. I think I could have improved my investigation by: · Obtaining more results to get a better overall result. When this happened we stopped the stopwatch. Do you have sufficient results to support your conclusion? In this investigation we will be looking at how concentration can affect the rate of this reaction We can control concentration by diluting solutions of known strengths There are several possible errors that could of gone wrong in this experiment, for instance, there could be errors in the measurements or possibly faulty equipment. · I would like to do a further experiment to confirm my results. It is usually expressed in terms of the concentration e.