Identification of an Unknown Organic Acid Essay

2627 Words Oct 11th, 2014 11 Pages
Identification of an Unknown Organic Acid Chem 1211K Lab
Drawer #15
Wednesday November 13th, 2013
Unknown Number: 3334025-CF13

Table of Contents Pg. #
Abstract 3 Experimental Report 4-7
Results and Discussion 7-12
Conclusion 13
**pKa Graph 14

Abstract Identifying this organic acid was an extensive task that involved several different experiments. Firstly, the melting point had to be determined. Since melting point can be determined to an almost exact degree, finding a close melting point of the specific unknown can accurately point to the identification of the acid. In this case the best melting point
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Lightest pink color also indicates end point for these trials. A blank titration can then be completed without using HCL. Initial and final volumes are recorded for each set as data. iii. The last part of this titration series is used to determine the equivalent weight of the organic acid unknown. Begin by determining the solubility of the unknown. Test about 0.1g of the unknown with deionized water. This particular acid does not dissolve right away so ethanol is to be added. The ratio ends up being a 4:1 ethanol to water ratio. Titration can begin (NaOH vs. organic acid). Put about 0.3000g of organic acid in a conical flash and dissolve with solvent system identified before. Complete titration in same way and with same set up as KHP and HCL titrations. After three good trials, complete a blank titration not using organic acid solution. Mass of organic acid as well as initial and final volume from all trials are recorded for data.
C. Data Search
Once melting point and equivalent are determined, a search must be completed using an internet search engine. Since the results for this specific unknown contained acids that have N, Cl, Br, or S, Sodium fusion or chemical testing must be done in addition to one trial of pKa experiment.
D. pKa
For this experiment, an analytical balance to weigh out about 0.2000g of the organic acid. This is then put into a beaker along with a stir bar. Acid is

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