Chem Lab Essay

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Experiment #4A- A Separation and purification Scheme Amena Alkeswani, PHCC Dhanlal Murally, PHCC September 27, 2012 Abstract: There are millions of different organic compounds. Most of them are found in mixtures and in order to achieve a pure form they need to be separated, isolated, and purified. However, there are endless numbers of possible mixtures, which make it impossible to have a pre-designed procedure for every mixture. So chemists often have to make their own procedures. The purpose of this experiment was to prepare the student to the real world by them designing their own procedure which will help them understand the techniques of separation and purification better. The goal was to extract two of the components of the…show more content…
9) Filter the ppt formed as result of step 7 from the newly acidic solution. Then wash the filtered ppt with distilled water. Allow the extracted benzoic acid to dry. 10) Weigh the extracted benzoic acid and measure the MP. 11) Dry out the methylene chloride solution that contain the benzoin and the dibromobenzene by the use of anhydrous sodium sulfate. 12) Pipet the remaining methylene chloride to a new beaker. Place the flask in hot water bath, and boil the methylene chloride out, leaving the benzoin and the dibromobenzene . 15) to separate the benzoin and the dibromobenzene, a crystallization should be performed 16) Heat some of the hexane to boiling and place the solid to be crystallized into an Erlenmeyer flask. 17) Pour a small amount of the hot solvent into the flask containing the solid. 18) Swirl the flask to dissolve the solid. 19) Place the flask on the steam bath to keep the solution warm. 20) If the solid is still not dissolved, add a tiny amount of hexane and swirl again. 21) After all of the solid dissolves, move the flask from the hot plate and allow it cool to room temperature. After a while, crystals should appear in the flask. 22) place the flask in an ice bath to finish the crystallization. 23) Set up a vacuum filtration 24) Separate the formed crystals (benzoin) and allow them to dry, then take the MP. 25) Optionally evaporate the mother liquor from pre

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