... this temperature of heat treatment may not have been lower than the mean result plotted at 30oC, as is shown on the graph by a slight dip. The size of the range bars causes one to question the reliability of the experimental data. These are especially large at higher temperatures of heat treatment (i.e. 70oC) where the gradient is steepening. At the lower temperatures of 30oC and 40oC, the range bars are overlapping. This means that one cannot be sure whether absorbance of light by the solution at 40oC does indeed decrease when compared to the previous reading. The range bars can be seen to overlap for the remaining temperatures of heat treatment, which means that it is hard to say within the error of the apparatus, what the exact value is. I am reluctant to draw a valid conclusion from the experimental data due to the significantly large percentage range ...

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