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Measurement of Water Hardness Write Up

Measurement of Water Hardness Write Up - Measurement of...

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Measurement of Water Hardness Matt Wolbers 10/10/07 Locker #65 B Experiment 3 Abstract :
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In this experiment we analyzed water samples for the combined concentrations of calcium and magnesium ions known as “total hardness.” We used the titration method of analysis which we obtained our results from. The results we obtained for absorbance for Blank (0 ppm) was 0.001, Standard 1 (50 ppm) was 0.025, Standard 2 (100 ppm) was 0.067, Standard 3 (250 ppm) was 0.118, and Standard 4 (500 ppm) was 0.237. We used the titration method because it is fast, easy, and one of the most widely used analytical techniques in many areas of chemistry and biology. Introduction: Water ‘hardness’ is a measure of the amount of hard water cat ions in water. These hard water cat ions include calcium, magnesium, iron, zinc and the other polyvalent metal ions. In most water samples, calcium and magnesium are the chief contributors to water hardness. The analysis for water hardness is based on the chemical reaction of Ca 2+ with an ion called C 10 H 12 N 2 O 8 2- . The actual name of this ion compound is called EDTA. The reaction involves one calcium and or magnesium ion reacting with on EDTA ion.
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