Abstract
Ethylenediaminetetraacetate (EDTA) complexes with numerous mineral ions, including calcium and magnesium. This reaction can be used to determine the amount of these minerals in a sample by a complexometric titration. Endpoints in the titration are detected using indicators that change color when they complex with mineral ions. A major application of EDTA titration is testing the hardness of water, for which the method described is an official one. Hardness of water also can be tested by a more rapid test strip method. The commercial test strips contain EDTA and an indicator chemical to cause a color change when the calcium and magnesium in water react with the EDTA. In this laboratory exercise, hardness of water is determined by both the EDTA titration method and with Quantab® test strips.
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Rice, EW, Baird RB, Eaton AD, Clesceri LS (eds) (2012) Standard methods for the examination of water and wastewater, 22st edn, Method 2340. American Public Health Association, American Water Works Association, Water Environment Federation, Washington, DC, pp. 2–37 to 2–39
Ward RE, Legako JF (2017) Traditional methods for mineral analysis. Ch. 21. In: Nielsen SS (ed) Food analysis, 5th edn. Springer, New York
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Nielsen, S.S. (2017). Water Hardness Testing by Complexometric Determination of Calcium. In: Food Analysis Laboratory Manual. Food Science Text Series. Springer, Cham. https://doi.org/10.1007/978-3-319-44127-6_16
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DOI: https://doi.org/10.1007/978-3-319-44127-6_16
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