Tripod Method Firstly I will draw a small dark cross on a piece of paper and place it on a bench mat.
In order for me to carry out my experiments I would need to change the concentration of Sodium Thiosulphate in the reaction between Sodium Thiosulphate and Hydrochloric Acid.
I would change the concentration of Sodium Thiosulphate by decreasing the volume of Sodium Thiosulphate and increasing the volume of water in ten different experiments.
Below is a table of how I would do this. In order for me to get an accurate result, I am going to carry out these experiments three times.
I will then work out the average result for all three and use that to create my graph which will tell me how the rate of reaction is affected by using different concentrations. In order for me to carry out my experiments I would need to follow the following procedures: Draw out an "X" on a paper and place it underneath the empty beaker.
Measure out the amount of Sodium Thiosulphate needed in one of the measuring cylinders and then insert it into the beaker. Measure out the amount of water needed in the other measuring cylinder and insert it into the beaker with Sodium Thiosulphate.
I will then time how long it would take the "X" on the paper to disappear. When it does I would stop the stop clock and note the time taken. After finishing on experiment I would clean out the beaker and dry it out. I would then start the next experiment.
Diagram of experiment and equipment used Whilst doing my experiments I would ensure that the following safety aspects are met: To make my test fair I am only going to change one aspect that will affect the rate of reaction.
The reason for this is because if I change the paper, it would affect the results because the "x" might be darker or lighter and this would take the "x" more or less time to disappear than the original paper.
I would also do the following to make the test a fair test: To work out the average result I added the time taken for 1 experiment from the three results, I then divided the total by 3.
For example, for the first experiment these were my results, From theses results I am now going to draw a scatter graph with a smooth line which will show me if the concentration affects the rate of reaction. My smooth line on my graph of results clearly shows that concentration of a substance does have an effect on the rate of reaction.
The graph shows that my prediction was correct, which was that as the concentration of Sodium Thiosulphate decreases the rate of reaction increases. All my experiments went very well as there was not any mistakes made. I ensured that the fair testing and safety details listed above were met.
Overall I think my results were very accurate as I got 3 results and worked the average for all of them, which I then used to create my graph. I also believe that my results were accurate because on my graph there were not any anomalous results.
I ensured that the equipment, mainly the beaker was cleaned after an experiment. If I had more time I would improve my investigation by measuring out the substances used very accurately and also not to rush my experiments so that I could have more accurate results.Note that if the temperature of a rates experiment was too low compared to all the other experiments, the 'double error' would occur again, but this time the measured gas volume and the calculated speed/rate of reaction would be lower than expected.
Strategy According to my results, as the concentration of STS solution increased the rate of reaction of my experiment was increased.
Also as the concentration of STS solution decreased, the time of . Investigate the rate of a reaction by measuring the production of a gas. There are a number of ways to investigate the rate of a reaction in Chemistry. Rates of reactions science (chemistry) coursework My coursework is based on rates of reaction.
This deals with the time taken for 1. draw an x on a piece of paper and pour ml of sodium thiosulphate and hydrochloric acid in different beakers.
Four Factors which affect Rates of Reaction: Surface Area - Surface area is the measure of how much exposed area a solid object has, Evaluation: One of the weaknesses of the trial run was that the person recording the time changed and this could of lead to slight deviation in the result.
However, other factors like the room. GCSE Chemistry - Sodium Thiosulphate Coursework We must produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction.