Chem 14 Water Lab Report

Chem 14 Water Lab Report - Dissolved polyvalent...

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Experiment 10: The Chemistry of Natural Waters By: Dan Morgenstern Partners: Mark Moore, Andy Mackowski, Dan Mendenhall November 13, 2006 TA: Dan Mao Room 105C Monday, 1:25-5:30 pm
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Introduction For the experiment, The Chemistry of Natural Waters , the goal was to obtain a water sample from a source such as a stream, sink in a building, water fountain, or anywhere that water was accessible. After this sample was taken, various tests to find the hardness of the sample were taken. The hardness of a water sample is defined as the presence of Ca 2+ (Calcium 2+) and Mg 2+ (Calcium 2+), which are the dissolved divalent (valence of 2) cations.
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Unformatted text preview: Dissolved polyvalent cations (valence of more than 2) also exist in the water sample. For example, water that has a large concentration of Ca 2+ and Mg 2+ would be considered hard, but if the sample had a low concentration of these divalent cations, it would be considered soft. Hardness can be helpful in everyday life duties, like washing things with soaps and detergents. Four students each took a water sample from their respective dormitory building and used various tests for their respective sample’s hardness for comparative reasons. An EDTA Titrations was one of the tests used for hardness determination....
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