A. The Cannabis Gummies were illegally shipped into the country but were intercepted at NAIA upon arrival. You are a chemist at PDEA and you are tasked to analyze Tetrahydrocannabinol (THC) in samples.
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- You are employed as a coop student at the Drug and Alcohol Testing Association of Canada (DATAC) developing analytical tests for sports doping agents. You are asked to prepare a procedure for the extraction of methylphenidate, the active compound in Ritalin, from urine samples (consider them as simple aqueous layers, you do not need to consider other components!). The goal of the procedure is to extract the methylphenidate into an organic layer which will then be evaporated, and the residue will be tested for the drug.Your colleague is helping you develop the urine test. They suggest that the urine should be adjusted to a pH above 7 before extracting with the organic solvent. Why is this necessary? Support your explanation with a full arrow-pushing mechanism for the reaction that would occur if the pH was below 7. Include all formal charges, intermediates (if applicable) and products.You are employed as a coop student at the Drug and Alcohol Testing Association of Canada (DATAC) developing analytical tests for sports doping agents. You are asked to prepare a procedure for the extraction of methylphenidate, the active compound in Ritalin, from urine samples (consider them as simple aqueous layers, you do not need to consider other components!). The goal of the procedure is to extract the methylphenidate into an organic layer which will then be evaporated, and the residue will be tested for the drug.You find that methylphenidate is highly soluble in 2-methyltetrahydrofuran, a bio-renewable solvent. Draw the structure of 2-methyltetrahydrofuran and give two reasons why it is a good solvent choice for liquid-liquid extraction.What is the purpose of adding sodium carbonate in the mixture of water and water- soluble components obtained from the solid-liquid extraction step of isolation of alkaloids from tea leaves? A.Increases the solubility of alkaloids in water thus ensuring maximum yield B.deprotonates tannins so that they will remain in the aqueous layer during liquid-liquid extraction C.'hydrolyses cellulose thus separating it along with other water-soluble components D.protonates the alkaloid to make the solution acidic
- A. The Cannabis Gummies were illegally shipped into the country but were intercepted at NAIA upon arrival. You are a chemist at PDEA and you are tasked to analyze Tetrahydrocannabinol (THC) in samples. 1. You know that these types of compounds can be analyzed by either GC or HPLC but you are told by your supervisor to use an HPLC for the analysis. What do you think are his reasons for choosing HPLC over GC?. Given the following drugs in a urine specimen: Cocaine alkaloid Secobarbital (a derivative of barbituric acid) Carisoprodol (a neutral drug) Devise an analytical flow chart that will be used to separate these substances from a urine specimen. The separation will be liquid extraction methods. Choose appropriate solvents and reagents based on the properties of the materials to be separated.Provide a brief justification for the following procedures in drug production. 1.Storing magnesium citrate in the refrigerator. 2. Filtering solution while its hot. 3. Cooled purified water in preparing calcium hydroxide solution. 4. Sterilization of materials for syrup preparation. 5. Addition of potassium iodide in Lugol’s solution.
- 1. To pass Chem 18.1, ELIBAP must be able to determine the melting points of three ester compounds extracted and purified from three different plants. Ester 1 Ester 2 Ester 3 :0: H. MW: 182.17 g/mol MW: 152.15 g/mol MW: 164.20 g/mol Possible Melting Points: -31 °C 64-67 °C -9 °C a. Given the molar mass and molecular structures of the esters, determine their most possible melting points. b. According to her friend who took Chem 18.1 last semester, one of the ester compounds exists as a solid above room temperature (25 °C) while the rest remain in their liquid forms. Identify the ester which is present in solid form above room temperature. Draw the structure.1) A polyester made from sebacic acid (CAS# 111-20-6) and 1,6-hexanediol (CAS# 629-11-8) has the molecular weight fractionation listed below. Calculate an appropriate average molecular weight for this polyester. Source: Batzer, H., Macromolecular Chemistry and Physics 5Part B: Miscibility of liquids 1. Place 10 drops of propan-2-ol into each of two DRY semi-micro test tubes. 2. Add 10 drops of water to one test tube and 10 drops of cyclohexane to the other test tube, shake and observe whether the two liquids in each test tube are miscible. Record your results then discard the contents of the test tubes into the organic waste container. 3. Place 10 drops of water in a clean semi–micro test tube and add 10 drops of cyclohexane to it. Record whether the two liquids are miscible. If two layers form (i.e. the liquids are immiscible) add a drop of blue food dye to the mixture and shake, then allow the two layers to reform. Based on your observation, decide whether the food dye is more soluble in water or cyclohexane and then discard the mixture into the non–halogenated waste container. Record whether the combinations of liquids shown below are miscible. Water Cyclohexane Propan-2-ol Cyclohexane
- A 1.5 L of organic compound solution contain 8.0 g of benzoic acid. Methyl tert-butyl ether (MTBE) solvent was used to extract the benzoic acid from the organic compounds into a diluted sodium bicarbonate solution via liquid-liquid extraction (LLE) method. The extracted benzoic acid was transformed into sodium benzoate aqueous solution after LLE. Calculate the total amount of the analyte extracted if the LLE process performed with 1:3 ratio for 3 times, with the recovery of 40% for every step. c)An organic chemistry laboratory Extraction; the extraction of crude naphtalene- benzoic acid mixture. Naphthalene is a suspect carcinogen and is toxic to aquatic life. Find an alternative pair of molecules that adhere better to the principles of green chemistry and can be separated by extraction using green' solvents. (kindly answer fully)What is an emulsion, how its form and how to avoid its formation?.