Experimental All methods and techniques can be found in Fundamental Techniques of Chemistry by Steven L. Brown. The techniques used are described in chapters 17 through 21 of this lab manual. Complexometric Titration Technique: A sample of water solution was titrated using a complexing agent known as EDTA, ethylenediaminetetraacetate, as the titrant. The equivalence point for this lab was when the solution turned form red to blue due to the presence of ErioT indicator. At the equivalence point, the moles of EDTA used equaled the moles of divalent ions present in the water sample. Ion Exchange Chromatography Technique: A sample of water solution was allowed to move through a 50mL ion exchange column. Each positive charge of metal ion in the water sample freed up one hydrogen atom. Thus, a divalent molecule would free two hyrdrogens. The ion exchange column was prepared by allowing 10mL of 3M HCL to move through the ion exchange column which recharged the column. Next, approximately 1000mL of distilled water was
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