The acid particles can only collide with the edge of the chip. The Disappearing 'X' Experiment investigates how a change in concentration of sodium thiosulfate affects the rate at which it reacts with hydrochloric acid. An increase in the temperature increases the average speed of the reactant molecules and the number or frequency of collisions. Procedure: Finding the rate, orders of reaction and rate. Once we are sure that the amount we have is accurate we will then put that in to a beaker on top of the cross. I will also investigate if there will be a change in temperature after the reaction has occurred. A method to allow people to visualise this process is to: Take a group of people As the people begin When they bump into a room, blindfold to move around, hard enough to them and split them they will bump into fall then they into 2 groups.
We will measure this by timing how long until the magnesium strip vanishes and there is no release of Hydrogen. A dependant variable as those factors in my experiment that I myself do not have any control over and independent variables are those controlled by me. Thereafter, I will wash out the measuring cylinder and put the biuret used for sodium thiosulphate to one side so that later on, I do not get confused with that biuret and the biuret used for hydrochloric acid. We will do the reaction at several temperatures and try to work the rate of reaction of sodium thiosulphate and 10cm3 of hy drochloric acid into a flask and when the two are mixed together u start the stopwatch. The whole procedure is repeated twice more and an average value calculated.
The rate of reaction will be measured by the amount of hydrogen gas H2 released. Will the frequency of collisions among students increase? The beakers and the flasks etc. I have done a preliminary experiment to help me decide the range of concentrations to use and how much of a difference in concentration to leave between each one. The factors I am going to control are: -temperature room temperature -pressure keep room pressure constant Make a prediction and explain it using scientific knowledge and understanding P6a, P8a. Concentration of solution- I will need to keep the concentration same throughout the experiment, otherwise the rate of the reaction will be affected and the results would be inaccurate and unfair.
Firstly, is the acid-base titration method which was carried out during this experiment. 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. Because there will be more collisions between sodium thiosulphate and hydrochloric acid. This will be done by mixing different volumes of the original sodium thiosulphate solution with water. The time taken for the solution to become fully opaque so that the mark is invisible is recorded as the rate at which the product was formed.
Precipitation- When some solutions are mixed they react and give a product which is insoluble. The Reaction Between Sodium Thiosulphate and Hydrochloric Acid The Effect on the concentration on the reaction between Sodium Thiosulphate and Hydrochloric acid Our aim in this investigation is to find out how the concentration of Sodium Thiosulphate affects the rate at which it reacts with Hydrochloric acid. I will also make sure that I use the same cross on paper every time and not switch between a lightly drawn pencil cross and a heavy cross drawn in black marker, as this would affect the time taken for it to disappear. 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 purpose of this demonstration is to investigate the effect of sodium thiosulfate concentration on the rate of reaction of sodium thiosulfate with hydrochloric acid. . The solutions will then be judged according to the same standard.
Because of the increase in the number of molecules, the number of collisions also increases as a result the rate of the reaction increases. Apparatus: · 100ml conical flask · Stopwatch · Thermometer · Different size measuring cylinders 5ml, 10ml, 50ml · Piece of paper. Therefore, in order to change the rate of a particular reaction, chemists must manipulate these particle collisions, either by increasing or decreasing their frequency depending on whether they wish to increase or decrease reaction rates respectively. They will inevitably bump into each other. From all this it can be understood that various things affect reactions but what affects the rates of reactions? Thus, high concentration solution will increase the rate of collision of molecules and also increase the rate of effective collision thus increase the rate of reaction. In gases, instead of concentration, pressure is a variable.
This can be seen when the time taken for the mark X to be disappeared is the lowest when 50ml of sodium thiosulphate was mixed with 10ml of hydrochloric acid. Moreover I will compare my results with those of my peers and also use results and findings of previous scientific research in this field of study to further verify my conclusions. Coursework about sodium thiosulphate and hydrochloric acid. Write down the factor you are going to vary and say how you will do this P6b. The dependent variable for all of the investigations was the time it took for the reaction to occur. Definition: The rate of a chemical reaction is defined as the change in the concentration of one of the reactants or products in unit time.
Then we drew a cross onto a piece of paper and put an empty conical flask on top of the paper. The aim of the experiment was to see how concentration affected the reaction rate, and according to the results, the difference 3. I will bring the stopwatch to my work area and as soon as the temperatures of the two chemicals match, I will pour the hydrochloric acid into the beaker and start the stopwatch. Reactions occur when the particles of reactants collide together continuously. At a lower temperature, the nu mber of collisions is lower because the particles are moving more slowly. Investigating Rate of Reaction Aim I am going to investigate the rate of reaction between calcium carbonate and hydrochloric acid. The final thing is to make sure that the acid solution is heated in a water bath as it is dangerous to heat acids on a Bunsen Burner.
It lowers the activation energy. This experiment involves mixing different concentrations of sodium thiosulfate with a constant known concentration of hydrochloric acid. I also predict that the graph from my results will look similar to this: Before carrying out my experiment, I will need to make sure that I concentrate on keeping certain factors in my experiment constant so that my experiment is a fair test. This report will investigate the processes involved in making superphosphate fertilizer, including the manufacture of sulfuric acid from sulfur using the contact process. Before carrying out my experiment I will need to clear my work surface of obstructions and wear goggles and a lab coat and also tie back loose clothing.