CHEM%2315%Fall%2014% Creating useful and beautiful molecules using synthetic organic chemistry – Synthesis of Aspirin and Indigo INTRODUCTION Aspirin Salicylic acid occurs naturally in the bark of willow trees. Prior to the 1800’s‚ willow bark was often brewed into a tea‚ or chewed to relieve pain. While the salicylic acid is effective at reducing pain it was found to irritate the lining of the stomach. It was mostly by chance that on August 10‚ 1897 Felix Hoffmann‚ a German chemist who obtained
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Lab 5 Column Chromatography: Isolation of Lycopene from Tomato Paste Reading: Zubrick‚ pages 79-82‚ 127-130‚ 138-139‚ 141-143‚ and 235-240 Pre-lab: look up the structure of lycopene. Introduction: Lycopene is the red pigment in ripe tomatoes and‚ as an antioxidant‚ helps to fight certain cancers. In this lab you will isolate lycopene from tomato paste. To do this you will first extract carotenoid pigments from the paste and then use column chromatography to isolate the lycopene from
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Alyssa Caparelli Organic Chemistry 12A Professor Alston October 28‚ 2014 Isolation of Chlorophyll and Carotenoid Pigments from Spinach Purpose The purpose of this experiment was to isolate ß-carotene‚ chlorophyll-A‚ and chlorophyll-B from spinach using column chromatography. Spinach was dehydrated using ethanol‚ and the pigments were extracted with dichloromethane. The spinach extracts were dried using CaCl2. Then‚ the solid pigments were run through a column using a non-polar solvent‚ hexane
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Using a 10-mL graduated cylinder or a 5.0-mL pipet‚ transfer 5.0-mL of vinegar to a 250-mL Erlenmeyer flask. Add about 25-mL of distilled water to increasethe volume of the solution for titration. (This will not affect your results) Add 2-3 drops of the phenolphthalein indicator to the solution in the flask. Obtained a 50-mL buret and place it in a buret clamp. Using a 250-mL beaker‚ obtain about 100-ml of 0.1M NaOH solution. Recorded the Molarity
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Introduction Reduction/Oxidation (Redox) reactions are ones that change the oxidation state of a compound. The oxidation state refers to the acquired charge (gained or lost electrons) of an element in relation to its original charge (i.e. S + 2e- S2+); in a compound‚ the overall oxidation state is calculated by adding all the charges of the elements present. The addition of electrons makes the element “reduced” and the loss of electrons is called “oxidized”. These reactions can be carried out
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NaOH solution in a 25 mL Erlenmeyer flask. The flask was swirled to produce a homogeneous yellow solution. The flask was swirled in an ice-water bath for 1-2 minutes and the solution was cooled to approximately 10°C. 1.95 mmol of NaBH4 was added while the solution was constantly swirled. It was added in three to four portions over a period of 3 minutes. The solution was allowed to stand undisturbed for 30 minutes at room temperature. After the time period‚ the flask was cooled in an ice-water
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of water. PROCEDURE Place 1.5 g of acetanilide in a 125-mL Erlenmeyer flask. Add slowly about 2.5 mL of concentrated sulfuric acid to the acetanilide. Dissolve most of the solid by swirling and stirring the mixture. Do not be concerned if a small amount of undissolved solid remains. It will dissolve in later stages of this procedure. Place the flask in an ice bath. Place 0.9 ml of concentrated nitric acid in another small flask and add about 2.5
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Abstract: Experiment 55 consists of devising a separation and purification scheme for a three component mixture. The overall objective is to isolate in pure form two of the three compounds. This was done using extraction‚ solubility‚ crystallization and vacuum filtration. The experiment was carried out two times‚ both of which were successful. Background Information: This experiment combined all the knowledge of the previous labs performed throughout the semester. An unknown mixture containing
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to prevent the beaker from falling over. b. Fill with 200-300 mL of water and 2-3 boiling chips. 2. Obtain a small square of aluminum foil sufficient to cover a 125-mL Erlenmeyer flask. Secure the foil over the flask with a rubber band. Puncture the foil with a pin to create a small hole. 3. Record the mass of your dry flask/foil/rubber band. 4. Draw a
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rubber stoppers Erlenmeyer flask Method: First experiment 1. Measure five milliliters of sodium hydroxide solution and pour it into the erlemeyer flask 2. Pour iron(III) nitrate into the small test tube and tilt the flask so you can slide the small test tube inside while taking caution making sure that the iron(III) nitrate does not spill 3. Now put the rubber stopper inside the flask to seal the beaker 4. Use the balance and measure the total mass of the flask with its inside 5.
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