Results - Discussion The standard deviations for the...

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Discussion The standard deviations for the complexometric titrations were very low indicating a good amount of precision for this method of the lab. The standard deviations where on whole two orders of magnitude smaller than the first measured significant digits. 30mL of Dasani water sample had to be used instead of 10mL since 10mL of sample reached the equivalence point too quickly and therefore made the results less precise. The Dasani water did this because it had less divalent ions per sample than other solutions so it took less EDTA to cancel out the lesser amount of divalent ions in the Dasani. At the end of the complexometric titration all divalent charge was assumed to come from the Ca2+ ion in order to calculate the ppm of calcium. When the assumed concentration of Ca2+ was compared to the calculated concentration of Ca2+ from the I.S.E. method the following ratios were found. .902(0Northpoint), .808(Kappa Alpha), . 752(Koffler), .833(Starr Pass), and 24.5(Dasani). A good ratio is one very close or equal
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Results - Discussion The standard deviations for the...

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