A qualitative analysis experiment was conducted to determine the identity of an unknown aldehyde or ketone. The tests include a Tollens test‚ a Schiff test‚ an iodoform test‚ and a derivative melting point test. The data of the first three tests was inconclusive. The final derivative melting point test was utilized to successfully determine that the unknown was the ketone‚ Propiophenone. Introduction: Qualitative analysis is a method or series of methods used to determine the identity
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TITLE PAGE PREPARATION AND CHARACTERIZATION OF SODIUM SALICYLATE OINTMENT INTENDED FOR TOPICAL AND SYSTEMIC DELIVERY BY MUOBIKE MAKUO 2005/136609 IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF DEGREE OF BACHELOR OF PHARMACY (B. PHARM) OF THE UNIVERSITY OF NIGERIA‚ NSUKKA. DEPARTMENT OF PHARMACEUTICAL TECHNOLOGY FACULTY OF PHARMACEUTICAL SCIENCES UNIVERSITY OF NIGERIA‚ NSUKKA. PROJECT SUPERVISOR: DR. I. V. ONYISHI OCTOBER‚ 2012. APPROVAL PAGE This is to certify
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temperature Step 8: Cooled the solution in an ice bath for 5 minutes Step 9: Collected the crystalized solid by vacuum filtration Step 10: Measured the melting point for the crystalize solid Reagent Table: Table 1: The chemicals and properties used in the reaction Compound Quantity Molar Mass (g/mol) Melting Point (C) Boiling Point (C) Anthracene 0.5g 178.23 216-218 340 Maleic Anhydride 0.25g 98.06 54-56 200 Potassium Bromide 100 119 63.38 759 Xylene 6mL 106.17
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Casting Pattern » Mold » Pour » Cool » Remove » Inspect Types of Casting : Expendable Mold‚ Multiple Use Mold Sand Casting : Expendable Mold casting process uses sand as molding material Requirements • • • • • • Mold : single or multiple use Melting Process Pouring Technique Solidification Process Mold removal Clean‚ Finish‚ Inspection METAL CASTING PROCESSES Categories • Expendable mold processes - mold is sacrificed to remove part • Mold (Sand‚ Shell‚ Vacuum‚ Expanded Polystyrene‚ Investment
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completes the statement or answers the question. ____ 11. The phase change that is the reverse of sublimation is a. deposition c. condensation. b. vaporization. d. melting. ____ 12. The phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first is a. melting. c. deposition. b. sublimation. d. vaporization. ____ 13. If a solid piece of naphthalene is heated and remains at 80°C until it is completely melted‚ you know that
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% by volume of the fat‚ a nitrogencylinder With flowmeter is connected to suction of feed pump 40 3-5 Crystallization System ( Refrigeration Load : 1T/ HR-50 TR) Average Composition of a General purpose Bakery Fat : High Melting Point Middle Melting Point Lower Melting Point Til Oil (Sesame) 43-44ºC 35-36ºC 28-30ºC 50% 35% 12% 3% 100% Equipment Fat Temp ºC RPM Residence In Out Time Seconds Performer I 47+2 34+2 400-500 20 Performer II 34+2 24+1 400-500 20 Maturator I 24+1 28+1 175-200 90-180
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The literature value for the melting point range for Trans-9-(2-phenylethenyl)anthracene is 130-133 oC. The obtained range was lower than that at 120.3 to 123.8 oC. Because it is lower than the known value‚ this means the obtain product is not completely pure. Impurities in the compound can result in a decrease in the compounds melting point‚ which is observed here. The impurities could be 1-propanol due to an insufficient drying. If the experiment was performed again‚ the product would need to be
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by Actual yield of synthesised aspirin: 0.347g 0.347/1.196 * 100= 29 Percentage yield: 29% Melting Points Compound Began Melting (°C) Totally Melted (°C) Range (°C) Pure Aspirin 136 1-2 Crude Aspirin 125 130 5 Product from Willow Bark 120 125 5 The documented melting point for pure aspirin is 136°C. An impure compound will exhibit a lower melting point than this‚ which is what was observed in both the willow bark product and the crude aspirin. Pure aspirin has a narrow
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How do different liquids and solids affect the boiling and freezing point of water? Name 02/12/12 ABSTRACT There are many different substances that affect the freezing and boiling points of water. This experiment was designed to test the effects of five liquid and five solid substances/mixtures on the freezing and boiling points of water. It was hypothesized that if we tested five liquid and five solid substances/mixtures then the results would show that the solids would have a greater affect
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determining the identity of the unknown sample are listed in Table 1. Density (g/cm3) Molecular Weight (g/mol) Melting Point (ºC) Polypropylene 0.905 42.08 170 Polyethylene 0.92 28.05 130-145 Polycarbonate 1.2 158 310 Polystyrene 1.05 104 240 Polyvinyl chloride 1.4 62.5 160-172 Table 1 Properties for five known polymers (Callister 737-775) The melting temperature of a polymer is the point at which it transforms from the solid form to a viscous liquid in which there is little molecular order (Callister
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