Analysing the results it was possible to notice that there was a relationship between the concentration of sodium thiosulphate and the time it took for the cross to no longer be visible on the white tile through the solution. From graph 1 it can be seen that the concentration of sodium thiosulphate and the time taken for the reaction to be completed are inversely proportional, since when the concentration of sodium thiosulphate increases the time taken decreases and the graph levels out as it approaches to the x -axis. Graph 2 supports this by showing that the concentration of sodium thiosulfate and the rate of the reaction share a linear relationship, meaning that the concentration is directly proportional to the inverse of the time taken. From the graphs it can be determined that the results are quite accurate since the data points are quite close together rather than spread out. This can be seen as all points are relatively close to the mean value on charts 1 and 2, without causing an asymmetry of the trend line. Both graphs and data tables show that no anomalous results were present. This is evident in the data as no point causes a significant change in the trend of the results. One possible random error within the experiment that could have caused a scatter in the results is parallax error. This error could occur whenever a measurement was taken from a graduated cylinder. This may have caused the time it took for the cross to disappear to be higher or lower than expected. If more thiosulfate were added, the reaction would have a shorter average time and therefore a higher reaction time. The results showed that some data points had a higher reaction time than expected, meaning this is a possible source of error within the experiment. ... half of the paper ... I'll do it too. Both of these suggestions would give a better average and reduce dispersion. Most of these changes are not necessary as the procedure is quite reasonable. However, a change in the apparatus could improve the experiment. For example, more equipment. Conclusion From the results collected and the graphs plotted it is evident that the concentration of sodium thiosulphate is inversely proportional to the time taken for the cross to disappear. While there are random and systematic errors, a trend can still be observed within the data. The experiment could be improved by making changes to the procedure and equipment. The initial hypothesis remained true when compared with the results acquired in the experiment. Upon completing the experiment it was discovered that the concentration of sodium thiosulfate was inversely proportional to the time it took for the cross to disappear.