Student #: 208860629
Lab TA: Marina Saccon
Lab Per wreaked: Tuesday phratry 25th2012, October 2nd 2012, and October 9th 2012
Lab Due: Tuesday October 16th 2012
CHEM 2080
EXPERIMENT 3: Determination of Halides
Introduction
The experiment is designed to explore the effectiveness of lead chemical analysis techniques in determining the ratio of halide leave in a sample. Halides are the elements located in host seventeen of the periodic table. They are known for their ability to form strong and stable ionic bonds, especially with group maven elements in the formation of salts. Halides are very common in the environment, with chlorine being the most abundant of them all. This is why there have been a variety of techniques that pill pushers have used over the years to analyze the presence of halides in various substances1.
The prototypical of the three techniques used in the experiment is volumetric titration technique, which is just subdivided into two visual techniques of analysis, the Mohr method and the Fajan method. Volumetric titration uses rudimentary titration methods to see halide concentration. The two methods of volumetric titration differ in their use of indicators to gift the compare point.
The Fajan method is named after American physical chemist Kazimierz Fajans and a dichloroflourescein indicator is used to indicate the equivalence point. The equivalence point in noted when the solution changes to a criticize colour. The Mohr method is named after German chemist after Karl Friedrich Mohr and uses chiliad chromate (K2CrO4). The colour of the solution at the equivalence point changes to a brownish red colour2. The following reaction has taken go down to completion by the equivalence point:
2Ag+Â (aq) + CrO42-Â (aq) ? Ag2CrO4Â (s)2
The second technique used in the experiment is the gravimetric technique. Gravimetric technique is very useful to analytical chemists and uses mass measurements to determine the angle of...If you want to get a full essay, order it on our website: Ordercustompaper.com
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