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Project11Final - Project 11 Final Report NAME Chem101 Lab...

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Project 11 Final Report NAME Chem101 Lab- Section 13 Instructor: NAME February 26, 2007 “My signature indicates that this document represents my own work. Outside of shared data, the information, thoughts and ideas are my own except as indicated in the references.” ______________________________________________________
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Abstract Project 11’s purpose is to identify an unknown compound and make predictions on how it might behave in a hypothetical situation in which it is spilled in a land-fill. The most important results were that the unknown was soluble in water and not soluble in acetone, concluding that the compound was ionic. The conductivity test also showed that the compound was ionic. An ammonium test and a flame test determined that the compound had a Potassium cation. In precipitation tests, the unknown formed a precipitate with chloride, concluding that the compound had chloride as an anion. A simple pH test with the unknown solution showed that the compound was neutral. The unknown solution had no reaction when mixed in an acidic solution, and also with a basic solution, further concluding that the unknown was neutral. Through these tests, the unknown was concluded to be Potassium Chloride. Introduction In this project, the purpose was to analyze an unknown compound with the task of helping the EPA safely dispose of it. To do this, the identity of the compound must be determined. Also, understanding its chemical properties and reactions with other substances and solutions is helpful in being able to determine the identity of the unknown compound. The toxicity of the compound can be determined by consulting the MSDS for the compound. This helps in realizing how to safely dispose of the compound and know what safety precautions should be demonstrated. Of course, lab coats and goggles should be worn at all times in the lab when dealing with both known and unknown substances. To find out what the unknown compound is, a number of tests can be performed. Pages 58 through 63 and also page 92 of Cooperative Chemistry Lab Manual is a valuable source of information for these tests and also how to determine the results. The qualitative solubility tests allow for determination of an ionic or polar compound. This works by observing if the compound dissociates in water, acetone, or toluene. The precipitation tests show which anion is present in the compound. Precipitation is the formation of an insoluble salt when mixed with a certain solution through double displacement. If an unknown solution forms a precipitate with a known solution, then it has an anion similar to that solution. The flame test can be used to see which cation is in the compound. This works by observing the color of the flame when burning the unknown compound. The color comes from the excitation of electrons, and the chart on page 63 lists which cations are a match for various colors. An ammonium test is performed in order to find out if Ammonium is the cation of the unknown compound.
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