Experiment 21Water Quality Testing By: Pooja ParikhLab Partners: Pratima, Sarah, Joseph3/13/18CHEM 1212 Section J-07TA: Yi CaoHonor Pledge-Freshmen Chemistry LaboratoriesI did not copy any portion of this work from the work of otherstudents, old lab reports, or unreferenced materials. Iunderstand that such activity is a violation of the Georgia TechHonor Code.________________________________________
Introduction: Natural water contains chloride ions, different concentrations are based on the mineral concentrations where the water is from. Pollutants can also affect water in that they increase the amount of dissolved oxygen in the water and lead to water with minimal toxic concentrations. Our first water sample was rainwater from West Village, while our second water sample was drinking water from Caldwell 1. Our method to determine the chlorine concentration was through titration using sodium nitrate in which a chromate indicator turns red in the presence of silver ions, and then silver nitrate is added to the water until the Ag+and Cl-react to form the precipitant AgCl, indicating that all of the chloride has been consumed and the remaining silver ions turn the solution red-orange. We then use the amount of silver nitrate added to determine the concentration of Cl-in the solution. To determine the amount of dissolved oxygen in the solution, a series of reactions must occur beginning with a reaction to oxidize Mn(OH)2to Mn(OH)3
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Bottomley, Total dissolved solids, Chemistry Laboratories, Pooja Parikh