The rate of reaction is the rate of loss of a reactant or the rate of formation off product during a chemical reaction.
Tripod Method Firstly I will draw a small dark cross on a piece of paper and place it on a bench mat. I will then put 40cm3 of sodium thiosulphate into a conical flask and place it on a tripod and gauze.
I will heat the solution for a few minutes until the desired heat is reached, i. Next I will place the conical flask on top of the cross, pour 5cm3 of hydrochloric into the hot sodium thiosulphate solution and time how long it takes for the cross to disappear.
On each experiment I will take three readings and work out an average from the data I have obtained. Below are diagrams to illustrate and explain my method Fair Test To ensure that this experiment is fair I will control the variables, i.
I will keep everything constant apart from the variable I am changing-temperature.
Therefore, I will make sure that I only change the temperature of the reaction mixture and keep the volume and concentration of the sodium thiosulphate, the volume and concentration of hydrochloric acid and the pressure of all the mixtures the same.
Furthermore I will measure out the volumes of both the sodium thiosulphate and hydrochloric acid to the greatest degree of accuracy I can manage. I will also try to make my timing and the heating of the sodium thiosulphate solution as accurate as possible.
Variables There are different variables which can be changed. I am, however due to my line of enquiry, going to change the temperature of the solution.
The independent variables will be the initial volume and concentration of sodium thiosulphate, and the initial volume and concentration of hydrochloric acid. Below is a table to show the effect of changing different variables. Safety I will make sure I handle the sodium thiosulphate solution and hydrochloric acid with care.
I will also be careful when heating up the solutions and will at all times wear safety goggles and also remain standing throughout the experiment.
Furthermore I will be careful not to spill anything and will take extra care when doing the experiment. Results Below is a table showing my results from the main investigation I can see from observing the table that the first part of my prediction was correct.
As the temperature increases the rate of reaction increases too, due to more collisions and more successful collisions, caused by the increase in temperature.
I am going to draw a graph analyse by results properly.
It also has a line of best fit to show the consistency and accuracy of the results. There are no anomalous results which shows that the experiment was very accurate. Furthermore, the graph is a perfect curve It is obvious that there is a general trend in the results.
As the temperature increases, the time taken for the sodium thiosulphate solution to become cloudy decreases. This is because as the temperature increases, the reactant particles move more quickly. In addition to this, more particles have activation energy.
This means more of the particles collide and more of the collisions result in a reaction, so the rate of reaction increases. My results do support the first part of my prediction.
Evaluation All of my results were accurate and fitted the pattern of results. I did not have any problem whilst carrying out my investigation apart and do not believe I could have done it any better without specialist equipment with plenty of time.
The quality of my evidence is good. There were no points on my scatter graph that were not on or close to the line of best fit. The range of my results were also suitable to make good observations and conclusions By comparing the repeated times on each of the experiments I can see that they were similar and each one was within two seconds of each repeat.Chemistry Coursework Planning Aim: To find the effect of concentration of thiosulphate on the rate of reaction between sodium thiosulphate and hydrochloric acid.
We are investigating this with sodium thiosulphate and hydrochloric acid. We will use different strengths of HCI acid and record the results.
Concentration of acid (M) Conclusion: From my results I can conclude that concentration does affect the rate dramatically.
For example if we compare strongest strength of acid (1 molar) to the weakest. The reaction of sodium thiosulfate and hydrochloric acid generates sulfur dioxide gas, which is a skin and eye irritant.
Perform this demonstration in a well-ventilated lab only.
Avoid contact of all chemicals with eyes and skin. Wear chemical. Chemistry Coursework Planning Aim: To find the effect of concentration of thiosulphate on the rate of reaction between sodium thiosulphate and hydrochloric ashio-midori.comuction: Word Equation for the reaction: Balanced Symbol Equation for the reaction: Observations during the reaction: • A yellow precipitate of Sulphur starts to form and the reaction mixture goes cloudy.
+Chemistry Coursework-How the concentration effects the rate of reaction between sodium thiosulphate and hydrochloric acid By Jess McFarlane 11WM Introduction Sodium thiosulphate and hydrochloric acid are two colourless solutions that gradually react together to form a cloudy yellow precipitate of sulphur when they are mixed.
The aim of my coursework was to test the rate of reaction. How I could test the rate of factor. Rate of reaction is how quickly a product is made or reactants are used up.
The chemicals that were used were Sodium Thiosulphate and Hydrochloric acid, as these chemicals are easy to handle. Conclusion The table above shows the results I got.