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Water Project - Complexometric Titrations Water Project and...

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Complexometric Titrations, Water Project, and Ion-exchange Chromatography Report Author: Spencer Stewart Co-Investigator: Nicole Dibona Kara Lamack Kayla Ward Supervisor: Xiaoyan Tu Sponsoring Organization: Chemistry 104B Section 101 Date Experiment was Performed: 28 February 2008 6 March 2008 Date Report was Submitted: 13 March 2008 Abstract By using Beer’s law and a spectrometer to measure changes in concentration during a reaction it was determined that the rate constant was roughly doubled when the concentration of bleach used in the reaction was quadrupled. The average k value for the experiment performed during the first week was 584.8/sec*M and 1181/sec*M for the second week.
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Introduction There were several objectives for these experiments. The first objective was to have students design an experiment, collect samples and prepare those samples for testing, and to use multiple experiments to solve a problem. The second objective was to have students then perform a complexometric titration, use that data to calculate the divalent metal ion content of water samples, and determine the hardness of water samples in parts per million. The third objective was to have students use an ion-exchange column, recharge an ion-exchange column, determine the moles of hydronium ion released by a column, and use titration to determine the total positive charge in a sample. All experimental work and collection of data was shared between the report author and the co-investigators. The molarity of the NaOH used for this experiment was determined in the Weak-acid Titration experiment and found to be .1098 M. This standardized solution was diluted in a 1:10 ratio. Experimental The procedures for this experiment can be found in the Fundamental Techniques of Chemistry , 6 th edition, author Seven L. Brown, Department of Chemistry, University of Arizona. Materials and Reagents All materials and reagents for this experiment were provided by the University of Arizona. Techniques All procedures and techniques for this experiment were provided in detail in the lab manual, Fundamental Techniques of Chemistry . One of the techniques important to this experiment was the use of a buffer solution to maintain a system favorable to a reaction. Another was the complexometric titration of a solution to determine the ion content of water.
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