*Recrystallization- solid compounds Recrystallization - precipitation of a solid cpd. from a saturated solution in the form of crystals through cooling or evaporation -7 steps: 1) selecting the appropriate solvent 2) dissolving the solute 3) decolorizing the solution 4) removing suspended solids 5) crystallizing the solute 6) collecting and washing the crystals 7) drying the product - 2 Kinds of Impurities: 1) more soluble 2) less soluble than the main component - impure
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down to room temperature. As the solution cooled down to room temperature crystals started to form. After reaching room temperature the Craig tube was then transferred into an ice bath until their no more crystallization. We then had to centrifuge the solution to separate the mother liquor and crystal. We then took the crystals out to try on a pre weigh watch glass (52.0994g) to dry. After drying the watch glass with crystal was weigh 52.1602g. It was found that the pure sulfanilamide recovery was
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impure solid compound is dissolved in a solvent and then allowed to slowly crystallize out as the solution cools. As the compound crystallizes from the solution‚ the molecules of the other compounds dissolved in solution are excluded from the growing crystal lattice‚ giving a pure solid.The first consideration in purifying a solid by recrystallization is to find a suitable solvent. There are four important properties that you should look for in a good solvent for recrystallization. 1. The compound should
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Learning Log 2: Observe‚ Connect and Reflect on Your Learning PART III – Symmetry in Crystals The most striking examples of symmetry…are crystals. Herman Weyl Study Period Focus Image Question Your Observations Week 5 Image 5 What observations can you make about these octahedra of cubic cristobalite‚ another polymorph of quartz‚ ‘frozen’ in volcanic glass? (no more than 50 words) (2 marks) What is your personal favourite gemstone and what is its space group. (around 10 words) (2 marks)
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Ice Cream Report 1. INTRODUCTION Ice cream is a complex colloidal system‚ which consists of air bubbles‚ ice crystals and fat globules. There are many formulation and [processing factors that influence the quality of ice cream. Stabilizer is such a factor‚ the function of stabilizer is to improve air incorporation‚ give body and texture‚ control meltdown of the ice cream(Keeney 1982).The aim of this report describes the procedure of manufacturing ice cream‚ and discuss what the
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be ready when a crusty film begins to form on top. What you’re left with is a more concentrated solution of sodium acetate. (You may notice that your solution is slightly yellowish or brownish.) * As the solution boils down‚ sodium acetate crystals will be left sticking along the inside of the pot. Don’t mix them back into the solution; you’ll need them later‚ so use a spoon to gather and save them separately. * Don’t let the film on top of your solution become thick or developed; this
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recrystallization‚ which relies on the different solubilities of solutes in a solvent. Compounds‚ which are less soluble‚ will crystallize first. The crystallization process itself helps in the purification because as the crystals form‚ they select the correct molecules‚ which fit into the crystal lattice and ignore the wrong molecules. This is of course not a perfect process‚ but it does increase the purity of the final product. The solubility of the compound in the solvent used for recrystallization is important
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is‚ and more importantly‚ how it affects the properties of plastics. Most people are familiar with crystals only because of salt and perhaps growing crystals as part of a school science project. Therefore‚ talking about crystals and plastics together is a new concept to many people. In reality‚ polymers are not like salt‚ which is totally crystalline‚ but are semi-crystalline. Unlike crystals like salt‚ polymers have only short-range order and a much looser organization. Crystallinity is one
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(drinking) water. In order to evaluate this effectiveness‚ the yield and purity of only the ice product is investigated before and after a number of wash cycles. A 1000g solution of 5 wt% CuSO4 underwent crystallization for one hour with the use of ice crystal seeding and the agitation of a stirrer at 500rpm. After the crystallization process‚ the mass of the ice product and filtrate were recorded. The ice product was then washed with de-ionised water under Buchner vacuum filtration‚ before the masses
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DISCIPLINE OF PHARMACEUTICAL CHEMISTRY DRUG DESIGN AND DISCOVERY BY: xxxxxxx Introduction A drug is a substance that we used mostly in our daily lives. It is a chemical substance with physiological effects when ingested or introduced into our bodies. The response produce can either be beneficial or harmful. Toxins and poisons can be classified as drugs. This report the term ‘drug’ is for medicinal or pharmaceutical purposes. Drugs used to prevent or treat diseases. Drug design
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