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Water Project Report

Water Project Report - Water Project Author Michelle...

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Water Project Author: Michelle Abercrombie, David Michael Lab Partners: Crystal Murphy Instructor: Ivan Ogloblin Chemistry 104B, section 19 Date work performed: 26 September 2007 – 17 October 2007 Date work submitted: 31 October 2007 Abstract: In this experiment we will be testing the overall quality of several different water samples taken from a home the cities of Tucson, Mesa, Show-Low, and Casa Grande. To compare these, four different tests will be used to compare the amount of metal cations in the samples to evaluate the quality of the samples. The hypothesis was that Show-Low would have the best water to bathe with, meaning the softest because it a small mountain town versus a large city. However, it was found that the water from Tucson had the softest water, and therefore the best water to bathe with.
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Introduction: Complexometric Titrations : The process of titrations is an old and useful process in the laboratory environment. The power of this process comes from its quick and easy method to find the amount of a compound in a solution. In the process of experimentation so far, titrations have generally been used for acid-base reactions, but the term for a titration is broader and can be applied to a variety of reactions with known stoichiometry. In this particular experiment titrations are performed based upon the formation of complex ions. The purpose behind this procedure is to determine the amount of divalent cations in a sample (M +2 ). To determine the concentration of the cations in the sample a common complexing agent will be added to the sample to produce a new complex ion. This agent that is to be added is ethylenediaminetetraacetic acid (H 4 EDTA) which acts as a hexadentate ligand and forms stable one to one complexes with almost every metal ion that is possible to be found in solution. The primary use of the experiment is to determine the amount of Ca +2 cations in a sample of water. The importance of finding the amount of these cations in solution is by the extent to which these cations play a role in the properties of the sample water. Commonly with the presence of Ca +2 it is referred to as water hardness with “soft” water contains very few amounts of the cations while “hard” water has a high concentration of the cation. The effect of this hardness comes into play when the cations react with soaps and detergents. In these reactions with soaps and detergents by the cations in the water, insoluble complexes will form and produce a precipitate commonly referred to as scum.
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