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Unk Comp - Identification Properties and Synthesis of an...

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Identification, Properties, and Synthesis of an Unknown Ionic Compound Chemistry 101 Laboratory, Section 21 Instructor: Craig Stanton November 18, 2008 ABSTRACT This paper describes the investigation of an unknown compound. Multiple tests were carried out in order to identify this compound which, in the end, was sodium sulfate. The first test that took place was a flame test. When the unknown compound was held over a Bunsen burner, the flame ignited into a bright orange flame, which indicated that the cation was sodium. A precipitate test was performed in order to determine the anion. Hydrochloric acid, barium chloride, and the unknown compound were mixed together and a white precipitate formed. Through the use of solubility rules, this determined that the anion was sulfate. After the hypothesis that the unknown compound was sodium sulfate was formed, tests for the physical and chemical properties were performed. These tests were performed on the unknown compound along with sodium sulfate from the stock room. The results for each compound matched each other, further proving that the compound was sodium sulfate. Once the identity of the compound was clear, an acid-base reaction was created in order to synthesize the products of sodium sulfate and water. Through vacuum filtration, the compound was separated from the water, dried out, and measured to find its percent yield, further proving that the unknown compound was indeed sodium sulfate. 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. I have submitted an electronic copy through Blackboard to be scanned by TurnItIn.com. In addition, I have not given aid to another student on this assignment.
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INTRODUCTION The main goal of this project was to identify an unknown compound that had been discovered in a landfill and compile as much information as possible about the compound’s chemical and physical properties so that it could be handled properly. The identity of the unknown compound was discovered through the use of many tests including a flame test, solubility test, and conductivity test, and precipitation tests. All of the results from the tests pointed to sodium sulfate. In order to find out as much about sodium sulfate as possible, multiple tests were performed. This is important because the compound’s properties determine how it is handled and disposed of. 1 The more that is known about the compound, the safer it is to handle. To go even further, each test was performed twice, once with the unknown compound and once with known sodium sulfate from the stock room. The results were compared to further prove that the unknown compound was sodium sulfate. Another goal of this project was to synthesize the unknown compound. Acid-base reactions were devised which would produce sodium sulfate and water. This could be useful if the compound had beneficial properties and therefore was desired for such beneficial purposes.
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