Evaluation
I am pleased with my results, as they are accurate and well produced with precision and skill. I know they are produced with precision and skill because there are no anomalous results. As I predicted it is a straight-line graph.
From my results, I have found that the higher the concentration of sodium thiosulphate, the quicker the reaction rates.
I have succeeded in what I planned to do, which was to find out how the concentration of sodium thiosulphate affects the reaction between hydrochloric acid.
The time taken for the reaction and the concentration are proportional as shown on my graph. The results I got were what I had expected and predicted and I did not get any anomalous results.
The results I got were what I wanted so I was happy with them.
The experiment could have been made more accurate by using other ways of doing things that were important to the experiment. Measurements that are more accurate could have been used as the measuring cylinders used were only to either every 0.5cm2 or 1cm2. This is not very accurate. To help make this experiment more accurate, I repeated it two times and then used the average of all the results to plot a graph with a line of best fit. I tried to keep all the variables except for the concentration of sodium thiosulphate the same for all the experiments. However, in reality it is impossible to keep all the variables precisely the same. For example:
b) It is also impossible to precisely measure out the amounts of Hydrochloric acid, sodium thiosulphate, and Water each time. …
