Sulfate Results

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As we can see from Table 5, removing the outliers we increase our accuracy. The difference between the class average and actual packet composition is now 0.5%, which is more accurate than our previous class average of 45.86% as seen in Table 2, being a difference of 3.66%.
The improvement of accuracy with Table 5, in the percentage of sulfate content in fertiliser, was because of the removal of outliers. Thus we are able to use those results, seeing as they were part of the original results compiled after the experiment was conducted. We can say that the results in Table 5 are more accurate and precise, seeing that we were able to receive a result between 40-45%. Thus showing that half the class had accurate results. Overall we can justify why the results were accurate; very close to the original value. These results are also precise as seeing that there was a higher concentration of results …show more content…
We chose to use Barium Nitrate, based on the fact that when Sulfate displaces Nitrate from Barium there is no risk that Nitrate will form another precipitate within the solution, since all Nitrates are soluble. This can be seen in Table 6, with the solubility rules. However if we chose to use Barium Chloride, you run the risk of Chloride ions binding to Lead ions that are found in the fertiliser, Table 5. This binding will precipitate out Lead Chloride, though this may be a small amount, it will still cause an increase in the percentage of Sulfate content in the fertiliser. Because of this information Barium Nitrate is solution to use to precipitate out Sulfate ions, seeing that when another cations bind to Nitrate ions, no precipitate will occur as a consequence. This could also be another explanation as to why other groups received a result way above what the normal sulfate content in fertiliser should

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