recrystallized with a 1:3 ratio of ethanol:acetone; which include 10 mL of ethanol and 20 mL of acetone‚ giving us a total volume of 30.0 mL. Once the 1:3 ratio of ethanol:acetone was added‚ the crude produce is then dissolved by heating the solution on hotplate with the heat knob on about 3-4‚ so as to not overheat the product. Once fully dissolved‚ the solution is left to cool to room temperature‚ then placed in an ice-bath for about 20 minutes. Then once again‚ the solid is isolated through vacuum filtration
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Experimental Synthesis of Aspirin and Melting Point Purity Analysis Donald Yeargin CH 222‚ Section 24221 Department of Chemistry Portland Community College Portland‚ OR Abstract The various methods available to synthesize aspirin lead to the need to examine and evaluate production efficiency and purity. The purpose of our experiment was to synthesize acetyl salicylic acid (aspirin) and then determine the relative purity of the synthesized sample by observing the melting point temperature
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order their first and main courses. The operation for an a la carte menu is similar‚ although customers may order by course according to their requirements. 1. The top copy of the food order goes to the kitchen and is handed to the aboyeur at the hotplate. 2. The duplicate goes to the cashier who makes out the customer bill. 3. The Flimsy or third copy is retained by the waiter at his/her sideboard as a means of reference. Any checks or bills that have to be cancelled should have the signature
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cobalt nitrate hexahydrate 4 ml 50% acetic acid ethanol ice glass rod dropper hotplate beakers measuring cylinder weighing boat test tube filter paper funnel filter flask aeration tube scale vacuum pump METHOD 12.01 grams of pure potassium-free sodium nitrite was weighed and added to 12 ml of cold water in a 100 ml beaker. This mixture was then heated on the hotplate until the solid was completely dissolved. The resulting solution
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general use here on TecHKnow Wiki Technician requirment for practical * 4-aminophenol * Clean appropriate size glassware * Access to Magnetic stirrer(s) * Buchner funnel and conical flash (filtering under vaccum) * Ice * Hotplate/bunsen burner * Oven (set at 45OC) Risk Assessment 4-aminophenol and ethanoic anhydride‚ are both IRRITANT’s- avoid contact with hands or breathing in vapours. If contact with skin or eyes wash with water: Paracetamol is dangerous in large
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stand and add filter paper to the filter funnel. 5. Put the rest of the mixture into the filter funnel and add water slowly to filter out the water and dissolved NaCl. 6. Evaporate the filtrate to dryness. 7. Put the CaCo3 into a dish and put on a hotplate to dry to a pure substance. 8. Once all substances are in their pure form measure. Diagrams: Results: Weights Apparatus Weights (g) 150 Ml Beaker 77.8 Beginning Mixture 12.24 50ml Beaker 35.18 Iron Filings 4.83 CaCo3 5.09 NaCl 3.33
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begins with a history of the company‚ by a session on what customers need to know to brew a perfect cup of coffee at home. These include purchasing new beans weekly‚ the right type of water to use‚ and the tips like never letting coffee sit on a hotplate for more than 20 minutes. The specific techniques for drink making are learned in an eight hour class on retail skills. Here new employees learned such varied skills as how to steam milk for latte‚ how to clean an espresso machine‚ the proper way
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Gas Chromatography: Purifying alcohol Introduction The goal of this lab is to understand the principles of chromatography by purifying alcohol using fractional distillation. Running standards with gas chromatography we were able to see and calibrate our data to find not only how much ethanol our alcohol attained but also what a mixed unknown sample contained. Chromatography is a way of being able to separate substances in solution that can help not only identify the analytes (the studied
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table. Next to the lounge is a kitchen. It’s very modern and bright. There is a black and white chequered floor‚ a large red table and two stools. As for some electrical gadgets used for preparing‚ there are a lot of them: a dishwasher‚ a range‚ a hotplate‚ a fridge‚ a freezer‚ a toaster‚ a coffeemaker‚ a cooker hood and so on. There are also a lot of utensils in a drawers: some canisters‚ can and bottle openers‚ pot holders‚ scouring pads‚ casserole dishes‚ pots etc. In front of the table there is
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Lab 2: Spectrophotometric Determination of Iron In Vitamin Tablets Objectives: - To determine the amount of iron in a generic vitamin tablet on a per tablet (in grams) basis. - To prepare standards using a pre-made iron solution to help determine the iron content in our generic vitamin tablets - Determine absorbances of our vitamin tablets and standards using the spectrophotometer Method: 1. Mass three vitamin tablets that contain iron 2. Place each vitamin in a 125-mL Erlenmeyer flask
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