Preliminary Tests and Solubility Classification of Organic Compounds Lirio, Stephen1, Tayag, Carlo A.2
1Professor, School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology; 2Student , CHM146L/C11, School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology
In this experiment, solubility class of various organic compounds are to be determined. The main objective of the experiment is to identify an unknown compound through the use of preliminary tests such as examination of physical state, color, odor, and ignition properties. Also, solubility tests were used to further examine an unknown compound’s solubility class. In this experiment, the apparatus used are micro test tubes and droppers for mixing purposes and Bunsen burner, clay triangle, crucible and cover for the ignition test. The reagents used in this experiment are: copper nitrate, ethanol, ethanoic acid, diethyl ether, 5% HCl, concentrated sulphuric acid, litmus paper, acetic acid, sucrose, methylamine, benzoic acid, 5% NaOH, 15% HCl, butyl bromide, buteraldehyde, nitro phenol, propanone, 5% NaHCO3, and phenolphthalein. This experiment is quite simple but it requires proper handling of chemicals since the chemicals used are toxic. Moreover, this experiment requires proper observation especially the solubility test. After the experiment, the students proved and accomplished the objectives.
In this experiment, the process of determining the structural composition of organic compounds based upon interpretation of simple solubility tests can be extremely useful in organic compound structure determination. Before proceeding, the difference between solubility and a chemical reaction must be explained. In some cases, a chemical reaction is occurring by a change in color or heat or by the formation of a precipitate. Solubility involves the formation of homogenous mixture. If the compounds are immiscible, two...
References: 1. Baluyut, J.Y., and De Castro, K. Organic Chemistry Laboratory Manual for Chemistry Students, Part 2, 9-10
2. Klein, D. (2012). Organic Chemistry. United States: John Wile & Sons, Inc.
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