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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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- Fall '07
- Chemistry, Hard water, water sample, Natural Waters