Lab Report Testing the Hardness of Water Essay

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Lab Report Testing the Hardness of Water

Water is the most important molecule that exists on the Earth. Without water living beings would not be able to live. Water is used for an immeasurable number of things. There are many properties of water, which makes this molecule so unique. One which people overlook is hardness. Hardness is defined in the Chemistry: The Central Science by Prentice Hall's as being "water that contains a relatively high concentration of Ca2+, Mg2+, and other divalent cations." Water containing these ions is not a health hazard; however, it is a problem for industries and households. Therefore, the hardness of water is vital to understand in order to prevent the problems it could cause. For one to have a better
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An experimental procedure in Penn State's version of Chemtrek August 2000-July 2001 on pages 10-12 to 10-20, which was written by Stephen Thompson, is a good procedure to determine the hardness of water. They used two different types of testing in order to compare the different results, the EBT and atomic absorption analysis and EDTA titration. The first procedure we did was the atomic absorption (AA) analysis. This was done by using a AA spectroscopy. First the water sample was by atomized and then a beam of monochromatic light is fired from a hollow cathrode lamp which emits a light that is set at a certain frequency that has the same frequency energy as the element you are trying to evaluate. The amount of light of the special frequency absorbed by the atomized sample reflects the quantity of the element that is set for. The calibration of the AA Spectroscope is found by putting samples with known concentrations into it and making a graph of the absorptions recorded from them and then by finding a corresponding regression line. Therefore, values for samples with unknown concentrations can be derived from the calibration graphs by plugging in the concentration into the equation. For example, with the water sample from Panama City, FL, the Mg concentration found using the AA test was 29.04 mg/L. If we plug that number in then we get the number .5724 which we can compare to the absorbance level which

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