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Water Project

Water Project - Water Project Author Austin Kelly Lab...

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Water Project Author: Austin Kelly Lab Partners: Alison Mensch , Maria Ortega, John Sanders Date Report Submitted: 8 April, 2008 Course: Chem 104B Instructor: Wenzhou Li Abstract: Four localized water samples were subjected to three different tests in order to determine what ions were in each solution. Each experiment was very accurate and performed nearly flawlessly. The complexometric titration section showed between 138 and 568 ppm for CaCl 2 , Ion exchange chromatography was a success, Ion-selective electrode showed the concentrations to be 0.110099g (as instructed), flame photometry could only be used for potassium and showed concentrations to be between 97 and 489.
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Introduction As the years have passed, the ease of acquiring healthy, contaminate-free water has increased quite a bit. As our society progresses, the amount of water being consumed each day increases. As we continue to filter the water from our lakes and rivers, we still wonder what is in the water as we consume it. In this lab, we will be sampling various sources of local water that we are sure has more than just H2O. We will be confirming this theory by the use of a variety of experiments on the same samples. The experiments that we will be executing are known as: Complexometric Titrations, Ion-Exchange Chromatography, Ion Selective Electrodes (potentiometry), and Flame Photometry. The lab of Complexometric Titrations is a simple and inexpensive way to determine what metal ions are in a particular solution as well as being able to determine the water hardness. The main ions that are determined in this lab are Calcium (II) ions as well as Magnesium (II). As the concentration of these ions increase, so does the water hardness. The main ingredient in this lab is known as EDTA solution which is a titrant solution. As a normal titration would occur, the solution with the unknown cation will be first mixed with an indicator and then a basic solution in order to change the pH of the total solution. The deciding factor on knowing what is in the solution is how much titrant (EDTA) must be added in order to cause a spike in the pH, making it rise from acidic to basic almost instantaneously. The amount of ions is able to be calculated simple by the equation [M +2 ] = (moles M +2 /sample volume). The parts-per-million, or water hardness, can
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