Solid-liquid extraction and liquid-liquid extraction of caffeine from tea leaves Andrew Jensen Lab partners: Jamie Pawluk‚ Joe Luong 230105559 Chem 250 L2 Oct‚4‚2012 Introduction: Extraction is the experimental procedure of obtaining a desired compound with the use of a solvent from either a liquid or solid mixture. Solid-liquid extraction involves the removal of organic compounds from solid material. This method of extraction may be achieved through extraction of the organic compound
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Evaluation of procedures: |Precision |The precision of each of the measurements you made is indicated by the % uncertainty calculated. | |Accuracy |The accuracy of an overall result (concentration of acid) means how close it is to the ‘true’ value. | | |It is possible to make very precise measurements but still end up with an inaccurate result because of a weakness | |
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EXPERIMENTAL PROCEDURE: 1. 2.07 g of the mixture of naphthalene and benzoic acid was weighed accurately on a balance. The mixture was then dissolved in 40 ml dichloromethane and the solution was poured into a separatory funnel. 2. 20 ml of aqueous sodium bicarbonate solution was added to the dichloromethane. A stopper was placed on the separatory funnel and was shaken and pressure was frequently released. The 2 liquids separated into clear layers and the lower layer (dichloromethane layer) was
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Introduction The purpose of this lab is to synthesize Lidocaine from 2‚6-dimethylaniline‚ using diethyl amine‚ 2-chloroacetyl chloride‚ acetic acid‚ and toluene. The Lidocaine was made by adding 2‚6-dimethylaniline to 2-chloroacetyl chloride in acetic acid. Sodium acetate is added in order to make the compound soluble. The product is dried‚ then treated with diethyl amine and toluene. This is refluxed using a water-cooled reflux condenser. The vapor is condensed by the cold water as the compound
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Unit 4B Task 2 Title Recrystallization of benzoic Acid Aim Equipment 1. Erlenmeyer flask 2. Graduated cylinder 3. Hot plate 4. Small beaker 5. Ice bath (if necessary) 6. Filter paper 7. Buchner funnel 8. Spatula 9. Weighing machine Method 1. Weighing paper was used to weigh approximately 1.00g of ‘impure Benzoic acid to produce re crystallization’. 2. Moved it to a 125ml Erlenmeyer flask. 3. Poured approximately 20ml of distilled water by using a graduated cylinder
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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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For my science exit project I decided to do a project that revolves around bacteria. I was suggested to do a project where I get a petri dish containing my oral bacteria and see the effects of liquid on my oral bacteria. I was very curious about this topic and wanted to know how the bacteria grows so I gave it a shot. For my project‚ I was told to make an “if and then” hypothesis. My hypothesis was that “If I put orange juice on a petri dish containing my oral bacteria then the bacteria on the petri
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Synthesis of Acetanilide Reaction O NH2 + H3C C O O C CH3 O N C CH3 H + H3C O C OH Aniline Acetic anhydride Acetanilide Acetic acid Purpose: Acetanilide is a useful precursor to many pharmaceuticals such as acetaminophen and penicillin. Experimental Procedure. (Estimated time: 1.5 h.) Unless otherwise noted‚ all manipulations should be done in the chemical fume hood. Place 100 µL of aniline into a tared 10 X 75-mm test tube (standing in a small beaker or Erlenmeyer flask). Now add
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Determining the concentration of vinegar Method Standard Solution 1. Place an electronic scale on a level surface and put a 50g weight on the scale and calibrate 2. Measure the weight of conical flask 3. Accurately measure a mass of KH(C8H4O4) near to 5g‚ placing it in a 250ml conical flask 4. Record the reading from the scale‚ subtract the weight of conical flask measured in step 2 5. Dissolve KH(C8H4O4) in a conical flask with minimum volume of distilled water 6. Transfer
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S.4Chemistry 2nd Term Project Be a Chemical Analyst-Analysis on ethnoic acid. Objective This experiment aims at determining the percentage by mass of ethanoic acid(CH3COOH) in a commercial vinegar using titration method. Chemical reaction involved: CH3COOH(aq) + NaOH(aq)→ NaCH3COO(aq) + H2O(l) Apparatus: An electronic balance‚ a 10.0cm3 pipette‚ a 25.0cm3 pipette‚ a pipette filler‚ a 250.0cm3 volumetric flask‚ a burette‚ stand and clamp‚ a conical flask‚ a white tile‚ 3 large beakers‚
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