The Chemistry of Natural Waters

Feb 3rd, 2012
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Princeton University
Course: chemistry
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After completing the AA spectroscopy and EDTA titration tests, I made a chart and compared my data to the rest of my group's data in order to make observations about our results. First, I had stated in my sampling plan that the order of the four water samples from hardest to softest AA and EDTA values would be: the water sample from Little Chickies Creek in Mount Joy, PA; the water from Stone Valley Lake in University Park, PA; the pond water along Orr Avenue in Apollo, PA; and then the water from the Allegheny River in Warren, PA. As I had proposed in the hypothesis, the creek water was the hardest sample. I classified the sample as hard to very hard because the total concentration of combined calcium and magnesium had an AA value of 167.3ppm and an EDTA value of 240.0ppm. An explanation for the hard water is that Little Chickies Creek picks up concentrated calcium and magnesium deposits from local limestone quarries as it winds its way toward the Susquehanna River .

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