Measuring the Melting Points of Compounds and Mixtures Introduction This exercise dealt with the melting points of pure mandelic acid and benzoic acid. The eutectic temperature and composition of mandelic and benzoic acid mixtures were determined. And finally‚ an unknown was identified by its mixtures and melting point. The melting point of a compound is used by organic chemists not only to identify the compound‚ but also to establish its purity. To determine the melting point two temperatures
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1: MELTING POINT AND BOILING POINTS OF ORGANIC COMPOUNDS ABSTRACT The properties of organic compounds depend on their chemical structures. Intermolecular forces of attraction affect physical properties such as melting and boiling point. Through the Thomas Hoover apparatus‚ the melting point of 8 test compounds was determined. Salicylic acid exhibited the highest melting point while naphthalene‚ the lowest. The stronger the intermolecular forces of attraction‚ the higher the melting point. Boiling
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Organic Chemistry Lab EXPERIMENT #2 and #3 Extraction and Evaporation Recrystallization and Melting Point Measurement PURPOSE: 1. To the components of a simulated pharmaceutical preparation‚ Panacetin‚ and identifying the unknown component of the mixture through extraction and separation methods. 2. To learn how to purify by recrystallization‚ how to dry them and how to obtain a melting point. PRECAUTION: ACETANILIDE AND PHENACETIN ARE EYE AND SKIN IRRITANTS. Minimize contact with
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Experiment 2&3 Recrystallization and Melting Points Determinantion of Benzoic Acid Abstract In experiment 2‚ recrystallization was used to purify the crude benzoic acid extracted from a mixture during experiment 1. Then a percent recovery for this recrystallization process was calculated. In experiment 3‚ the melting point ranges of the crude and purified benzoic acid were both determined by using Melt Temp Apparatus. Introduction Recrystallization is a purification technique for non-volatile
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is done by observing the melting point. This is important because if there is an impure substance the melting point would be depression and the melting range would be broader. By finding the melting point of a known substance one can then observe an unknown substance’s melting point to see if the points are the same and try to figure out the unknown. Experimental Section: The first known substance we used was Biphenyl. 68 degrees Celsius is the known melting point. We used the capillary method
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Crystallization is a delicate procedure that involves the slow formation of a crystalline solid. Rapid formation of an amorphorous solid is called precipitation‚ which can contain many impurities. "The purest crystals are obtained when crystallization occurs slowly from an undisturbed solution".2 In general‚ crystallization is the easiest process to purify a solid substance to an acceptable quality for basic laboratory work. EXPERIMENTAL SECTION The experimental procedures can all be found in the PSU
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Summary Purpose To purify the component (unknown) of Pancetin from last experiment and then compare its melt point to the two other possible substances. Theory Panacetin should be made up of about 50 percent of the unknown component that we previously separated out of Panacetin for testing. We suspect that this unknown compound is either acetanilide or phenacetin. From the solubility of acetaminophen and phenacetin‚ we could know both of them are relatively soluble in boiling water but insoluble
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spring and summer is the principal melting energy source. Most operational procedures for snow melt prediction rely on ambient air temperature as the index of the energy available for melt. The temperature index is usually used to characterize the level of the energy balance because it is superior to other simple methods for the full energy balance at the snow surface. As long as snow remains bright‚ the sunshine bounces off and is not retained to cause any melting. Two factors other than sunshine
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Our Iceberg Is Melting is written by John Kotter‚ the leadership and change guru at Harvard Business School and Holger Rathgeber‚ the modern global manager from Frankfurt‚ Germany. The main topic and the author’s purpose in writing the book are to make successful change through the eight step process. The type of the book is management book that can use by people in every level such as manager in one organization‚ high school student‚ executives‚ retirees and others in order to better achieve what
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Metaphor of the Melting Pot Peggy Ruth Geren The melting pot has been used metaphorically to describe the dynamics of American social life. In addition to its descriptive uses‚ it has also been used to describe what should or should not take place in American social life. How did the term originate? How was it used originally? How is it used in contemporary society? What are some problems with the idea of the melting pot? How is public education connected to the idea of the melting pot? How does
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