and wash the crystals with cold water and cold methanol. We then began the recrystallization process. During the recrystallization process‚ the product was a white chucky large crystals‚ when the boiling methanol was added there was a color change from white to yellow. The color change was due to the conversion of aromatic properties. We then place solution in an ice bath to recrystallize the product. At this point the crystals were sand like and white in color. We then wash the crystals with
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Introduction: The purpose of this lab was to identify an analgesic drug and to understand how to interpret infrared spectroscopy. The lab consisted of several steps‚ which include extraction‚ distillation and filtration. Based on the active ingredient crystals that were obtained at the end of filtration‚ the melting point was found. The active ingredient percent recovery was calculated and compared to the manufacturers claims. Next‚ the Rf value of the active ingredients were found through a TLC plate
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Name: __Huram-abi ________________________ Date: 9/20/2012______________________ Student Exploration: Mineral Identification Vocabulary: crystal‚ density‚ hardness‚ homogeneous‚ luster‚ mass‚ mineral‚ streak‚ volume Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Suppose you find a yellow piece of metal in a stream. How could you tell if it is real gold? _To tell if it’s real gold check out it’s density‚ find it’s mass and volume‚ see if it’s luster
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nitrate Colourless crystal Na+ Yellowish Orange NaClSodium chloride Colorless crystal Cl+ Yellowish Orange LiNO3Lithium nitrate Colorless crystal Li+ Red BaNO3Barium nitrate White crystal Ba² Bright yellow‚ lime yellow Sr(NO3) 2Strontium nitrate White crystal Sr² Dark red Cu(NO3)2Cupric nitrate Blue crystal Cu² Green‚ bluish green. Ca(NO3) 2Calcium nitrate White crystal Ca² Redish orange KNO3Potassium nitrate Colourless crystal. K+ Light purple Unknown #1 Colorless crystal Red Unknown #2
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used in crowns‚ veneers and fillings. Enamel consists of approximately 96% inorganic minerals and 4% organic material. These inorganic components of enamel are made up entirely of hydroxyapetite crystals‚ these crystals are the largest crystals throughout the whole entire human body. Unfortunately these crystals are susceptible to rupture by acids‚ but are the greatest teeth protectors. A big help when it comes to dealing with trying to protect teeth on a daily base is the fluoride that is took in when
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low percent yield can be partially attributed to loosing crystals in each transferring step. When the product was poured into the funnel a lot of the crystals were retained at the bottom of the test tube. Then when washing the test tube out with solution some of the crystals were suspended back into solution because the solution used was not ice cold. For further experiments this step will only use chilled solvents when washing the crystals in the funnel and the test tube to avoid having yields this
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After a week‚ solution was poured from the crystals. Methanol (10 ml) was then added to the flask containing the crystals and. the accumulation of the crystals was broken down with a stirring rod. The crystals were collected by using a Bucher funnel with a filter paper‚ a rubber adaptor and a filter flask connected to a vacuum. Crystals were washed out of the flask with the filtrate and rinsed off on the funnel with 10 ml of methanol. Crystals were then spread on a paper towel to completely
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The Discussion of this experiment began with discussing how many materials we use today are actually mixtures of pure substances. The separation of these materials into their pure substances can be quite challenging. When we are discussing separations of a mixture that contains pure substances‚ it all depends on whether you can separate the substances by physical means. That means‚ utilizing each substances physical properties such as boiling point‚ melting point‚ and magnetism. Separation of a
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three important concepts. The first is that a compound is always more soluble in hot solvents than in cold solvents. Secondly‚ molecules have unique solubility properties. Lastly‚ a growing crystal will only accept similar entities into its lattice. This is related to the crystal lattice theory which states crystal formation is anti-entropic based on the equation ∆G =∆H-T∆S. There are three stages of solubility: collision‚ dissociation‚ and solvation. In order to raise the probability of collision
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