Rinse a 250 ml volumetric flask with deionized water. 7. Label the volumetric flask so you know which solution is in it. 8. Place a clean funnel into the mouth of a 250ml volumetric flask.
Once cool to touch the squeeze out all the tea bags carefully without tearing them apart. Using a separatory funnel extract three times with 15.0ml of dichloromethane gently rocking bath and forth the funnel venting the funnel often each time. Carefully decant into a pre-weighed 125ml flask and add the drying agent-calcium chloride pellets- and the organic layer was evaporated off in a warm water bath. Using aluminum foil as support around the mouth of the flask place test tube in the flask and heat the flask on a hot plate whilst adding water into the tube without letting it boil. Once the caffeine forms crystals around the test tube scrape off all the sublimed product and weigh the dried product 0.1grams of caffeine and had a melting point range of 175-230
The vacuum pump was switched on to suck the evaporated volatile solvent. After 30 minutes of evaporation, the heating system was switched off and left to cool down for another 30 minutes. Finally, the flask was weighed and the concentrated extract was taken out. 3.5.1
Then it was left to boil under for 1hour. After which round bottom flask was removed from the reflux setup and held first under running room temperature water and then an ice bath until it cooled down enough to comfortably handle it. Next the cooled solution is poured into a 100ml volumetric flask and topped it off to the mark with denoised water. Subsequently, 20ml of this solution was pipetted into a conical flask. To this, 80ml of cold water and 15ml of 2M HCl was added to the conical flask.
Then, we did reflux for 75 minutes. After reflux, we removed the reaction mixture from the apparatus and cooled it for several minutes. We transferred the mixture to the beaker that contained water (30 mL). We cooled the mixture to room temperature and added sodium carbonate to neutralize the mixture. We added sodium carbonate until the pH of the mixture was 8.
A spin vane was added and a water-jacked condenser was attached. Isopentyl nitrite (0.06ml, 0.045 mmol) was dissolved in 1,2-dimethoxyethane (0.50 ml) in a 3-ml conical vial and caped to prevent loss by evaporation. Running the reaction. The mixture in the 5-ml conical vial containing the tetraphenylcyclopentadienone and anthranilic acid was heated on an aluminum block to 140° C. Once the mixture started to boil the prepared mixture of isopentyl nitrite was added to the 5-ml conical vial through the top of the condenser using a pasture pipette. The solution continued to boil for 25 more minutes until a
This solution was then heated for 15 minutes until a precipitant formed. This precipitant was white and looked slightly powdery. The liquid in the round bottom flask was poured into a test tube filled with 15mL of water. When this was done, two layers
Repeat the experiment. The cola drinks were titrated using the following method: Prepare the beverage in a 250ml volumetric flask. Use a funnel to facilitate the process. Place the beaker on a hot plate so that it boils and place a watch glass on top to prevent the carbon dioxide from the atmosphere getting dissolved in the cola. Once the cola starts to boil, continue to boil it for another 10 minutes so that the carbon dioxide is removed.
Thanks to the boiling chips, the heat is evenly distributed within the flask, which permits a more controlled boil and eliminates the possibility of the liquid in the flask bumping into the condenser[5]. The tedious distillation process is rather simple: the beverage evaporates in the distillation flask and, having no where else to go, enters the condensing tube, where it cools down and is converted back into liquid form. From there on, this liquid flows into the final container, a graduated cylinder [preferably in an ice bath]. The extracted distillate is otherwise known as ethanol, a clear, colorless, flammable liquid, produced through the process of glucose fermentation and frequently used as an intoxicating agent in liquors[6]. In relation to a previous experiment in which the students determined the boiling points of two liquids, it was deduced that the boiling point of [propyl and methyl] alcohol was estimated to be around 80oC.
Description of Organization, all subsidiaries and/or strategic business units Merck & Co., Inc. was founded in 1891 and is a leading pharmaceutical company with headquarters in Whitehouse Station, NJ. First quarter earnings in 2012 were 11.7 billion dollars worldwide, with revenue being produced from pharmaceuticals, animal health, and consumer care. (Merck Financials 2012)Through science and innovation Merck is one of the largest healthcare companies in the world, delivering vaccines and medicinal needs to humans and animals. (Merck Sharp & Dohme Corp 2009-2012) The organization inside the United States of America is recognized as Merck and & Co, Inc., while outside the U.S., the organization is known as Merck Sharp and Dohme (MSD), or