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Unformatted text preview: form complexes. Magnesium nitrate was also added to enhance the indicator color change. When the indicator turned the solution to a blue color, this marked the endpoint of the titration. From the volume of titrant added, one was able to calculate the concentration of metal ions present in solution. One series of titration just measured the calcium content in a water sample while the other series of titration measured the amount of calcium and magnesium present in solution. From this experiment it was found that in a pond water sample the amount of calcium present was about 171 +/- 6 ppm and the magnesium present was found to be about 39.7 +/- 5.5 ppm. From these results it was found that calcium is in a much higher concentration than magnesium in a natural water sample....
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- Spring '07