The Purity and Purification of Solids- Part 2- Recrystallization Courtney Percival CH 337 Laboratory‚ Section 037 Department of Chemistry Portland State University‚ Portland OR ABSTRACT INTRODUCTION Recrystallization is a commonly used tool in laboratories when dealing with impure solids. "An effective recrystallization is one in which 1) a high degree of purity is achieved as well as 2) a maximum recovery of sample".1 Solubility‚ the tendency of a substance to dissolve in a liquid‚ is an
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Synthesis of Salicylic Acid and Potentiometric Determination of its Purity and Dissociation Constant ------------------------------------------------- Abstract The purpose of the study is to synthesize salicylic acid from the ester‚ methyl salicylate‚ and determine the acid’s dissociation constant and purity. The ester was converted to salicylic acid by base hydrolysis. The products were refluxed and recrystallized‚ to ensure maximum purity‚ and filtered‚ dried‚ and weighed. The melting point of the product
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Purity and Innocence –Comparing Tess Durbeyfield with May Welland Tess Durbeyfield‚ the innocent and exceptionally gifted peasant girl of decayed aristocratic stock‚ is described as “A Pure Woman” by Thomas Hardy in the novel’s subtitle; May Welland‚ a beautiful girl immersed within the New York society upbringing‚ in Newland Archer’ eyes‚ is innocent‚ childlike and carefree. But as the two plots thickened‚ Tess is regarded as impure by everyone in the novel and we realize that May is more
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conduct the synthesis of aspirin‚ acquire the skills of recrystallisation using normal filtration and reinforce the technique of the melting point determination. The method used to synthesize aspirin was esterification by reacting salicylic acid with acetic anhydride with the presence of dehydrating agent‚ conc. sulphuric acid‚ to speed up the reaction. Having obtained the crude aspirin which was still impure‚ recrystallisation was conducted to remove the impurities. The aspirin harvested at the end
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Balder: God of Light‚ Joy‚ Purity‚ Beauty‚ Innocence‚ and Reconciliation The god of light‚ joy‚ purity‚ beauty‚ innocence‚ and reconciliation. Son of Odin and Frigg. He was loved by both gods and man and was considered to be the best of the gods. He had a good character‚ was friendly‚ wise and eloquent‚ although he had little power. His wife is Nanna‚ daughter of Nep‚ and their son is Forseti‚ the god of justice. Balder’s hall is Breidablik ("broad splendor"). Most of the stories about Balder
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blackeys’ games and generally manifest a desire to be blacks. Well‚ Niss Moses‚ if this were a common phenomenon‚ we most assuredly would have such a word‚ but it happens not to be.” — William Satire (alias Douglas Hofstadter)‚ “A Person Paper on Purity in Language” I highly enjoyed Douglas Hofstadter’s piece. Although I had never given any serious thought to the problem of sexism in English‚ I found myself strongly agreeing with many of his arguments. In fact‚ I even became a bit angry and ashamed
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Caso: BAYER AG CHILDREN´S ASPIRIN Integrantes silvia gutiérrez díaz ……...………………………………………...…………………….. A00259818 rodrigo garcía pérez ……..………….………………………….................................... A01060397 carlos axel costal domínguez …………………………………................................... A00664351 franz vidar romero gómez .…..………………………………..................................... A01061184 jorge h. viIlegas garcía ……….…………………………………....................
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Jane Eyre Mr Rochester only loves Jane for her purity Charlotte Bronte was born 2 April 1861‚ third of the six children of Patrick Brontë and Maria Branwell Brontë. In all her childhood was a sad one. Her mother died in 1821‚ with her absence‚ she and two of her older sisters were sent to a school. Conditions there were bad‚ even for the standard of the time. It was not long before both her sisters became ill and were sent home‚ where they both dies in the spring of 1825. Proceeding this her
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Task 3: M1 I weighed my paracetamol tablets before I started the experiment so I was able to work out the percentage yield and percentage purity. If I never weighed the paracetamol tablets which I used‚ the calculations wouldn’t be accurate. I warmed the two paracetamol tablets with propanone in warm water in order to dissolve the paracetamol and soluble impurities. This then left the undissolved material which I was then allowed me to carry out filtration and remove any insoluble impurities. The
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Introduction: The method for purifying solids 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
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