Molarity Of EDTA

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The objective of Experiment 15 is based on calculating titer and molarity of EDTA and parts per million of Calcium carbonate through standardization and titration. Calcium carbonate, an ammonia buffer of pH 10, deionized water, and eriochrome black T are put into a Erlenmeyer flask and is then titrated with EDTA in a buret. The endpoint then reveals the titer of Calcium carbonate and the molarity of EDTA. Hardness is determined similarly. An unknown water, C, sample is put into a flask with eriochrome black T and an ammonia buffer of pH 10. The buret of EDTA titrates into the water sample until the endpoint occurs. This titration exposes the parts per million of calcium carbonate in the unknown water sample. The parts per million allows the experimenter to determine the water hardness level.…show more content…
The EDTA had an average molarity of 5.371E-7, with an even lower standard deviation of 5.532E-13. The titer of CaCO3 had a low average of 0.9465 and a standard deviation of 5.77E-05. Therefore, each solution was dilute. In relation to Water Sample Analysis of Unknown C, the parts per million of CaCO3 in 50.00mL of H2O is on average 104.25ppm. This reading indicates that the unknown sample is moderately hard water. Moderately hard water is safe to drink, though not ideal. In a functional setting the minerals could build up around pipes and cause some

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