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- ANALYSIS 14. Prepare a drying-apparatus that uses the water aspirator on the bench. Transfer the Büchner with your solid (crude or recrystallized) to this setup. Dry the solid for approximately 10 minutes. Break the solid clumps apart every now and then with a spatula to accelerate the drying process. 15. Weigh the dried solid so as to calculate a reaction yield for your report. 16. Demonstrate the identity and purity of your acetaminophen product (crude and purified, if you were able to recrystallize it) using: TLC: Dissolve a small amount (~10 mg; the tip of a spatula) in a small volume of ethyl acetate (~1-2 mL) in a test tube before spotting on your plate and eluting. Melting point analysis: Pure acetaminophen melts at 169 °C. Pack a small amount (~ 2 mm of height) of solid in a melting point capillary, and record a melting point using the appropriate apparatus. Heat rapidly at first, but slow down when you get near (~20° below) the target melting point to obtain a more accurate…Which of the following statements is true? A Liquids can be weighed using a weighing paper. B In weighing hygroscopic substances, containers should always be kept close when not in use. After drying a sample in the oven, you can place it immediately inside the analytical balance. D Place solid reagents / precipitates directly on top of the balance pan.Standard Preparation: 1. Weigh 10 mg of the Acetaminophen RS accurately and dissolve in 15 ml of methanol. Shake well. 2. Add 85ml of water to adjust the volume to 100 ml. 3. Pipet 5 ml from the stock solution and dilute to 50 ml with water. Test Preparation: 1. Weigh the 10 tablets individually and record on the worksheet provided. Powder 10 tablets and weigh a portion of the powders equivalent to 100mg. 2. 3. Transfer the powders into 100 ml VF. 4. Add 15 ml of methanol, shake to dissolve and dilute with water to the volume to make 100 ml. 5. Pipet 1 ml from the previous solution, transfer it into a 100-ml volumetric flask and dilute with water to volume. Instrument: UV-Vis Spectrophotometer Blank: water Cell- 1cm quarts cell Wavelength:243 nm Procedure: 1. Turn on the power switch. Allow the instruments to warm up for at least 20 minutes to stabilize the source and detector 2. After the warm up period, set the desired wavelength using the UP and DOWN arrows. 3. Using the MODE Key,…
- How was the precipitate obtained after filtration? By scraping from the filter paper and transferring to a watch glass. By redissolving in hydrochloric acid. By drying the precipitate on the filter paper using a desiccator. By charring the filter paper and igniting the product in a crucible.REACTION RECRYSTALLIZATION (OPTIONAL) 1. Begin assembling your reflux apparatus (i.e. lab jack, stir plate, exten- sion clamp and round-bottom flask of appropriate size). 10. Weigh your crude solid to calculate an approximate crude yield. Transfer most of it to a 125 mL erlenmeyer, but keep some aside (~100 mg) for analysis at the end. 2. Add para-aminophenol (15.0 mmol), demineralized water ([para- aminophenol] = 0.75 M) and a stirbar to the flask. Set to stir vigorously. 11. Recrystallize your solid by boiling in an erlenmeyer in a minimal volume of demineralized water (~8 mL/gram of crude solid) on a hot plate to fully dissolve it. If necessary, slowly add water portion-wise until a homogeneous solution is obtained. 3. Measure the required volume of acetic anhydride (1.30 eq.) in a small graduated cylinder. Using a platic pipette, add it to the reaction flask. 4. Finish the assembly of the reflux apparatus (i.e. secured water con- denser along with tubing, heating mantle and…Accurately weigh out about 6g copper(ii) sulfate crystals into a weighing boat. Use the copper(ii) sulfate crystals to make up 250cm3 of standardized copper (ii) sulfate solution Pipette 25cm3 of this solution into a conical flask Add 1.5g potassium iodide and swirl thoroughly Titrate this solution with standard 0.1 moldm-3 Na2S2O3 in a burette. When the iodine color fades, add 1 cm3 starch indicator. Use your titration data below to calculate the percentage by mass of copper in the copper(ii) sulfate crystals.
- i need help determining amount recovered in an extraction. i started with a .51g mix of naphlathene/benzoic acid. then, i ended up with the organic in the flask weighing 56g, with the initial weight of the flask without product being 46g. how do i determine amount recovered AND the % recovery?Occasionally you will have solid impurities “trash” in your heated recrystallization solvent. How do you remove these impurities?When isolating the solid after recrystallization using vacuum filtration what solvent should you use to aid in the rinse from the Erlenmeyer flask to the vacuum filter funnel? (Only pick one answer) Group of answer choices: Cold ethyl acetate Cold ethanol Hot ethyl acetate Hot ethanol Hot water Cold water None of the above, it should not be risned
- Write TRUE if the BOLD word/phrase makes the statement correct. Otherwise, write the correct WORD/PHRASE that will make the statement true. If there are two bold words/phrases in a number, write your answer for EACH of the bold words/phrases. 1. The addition of excess charcoal would decrease the % recovery in the purification by recrystallization. 2. If the target compound is contaminated with impurity, the melting point will be higher than the theoretical value and the melting range is large.Is recrystallization a good method for purifying any product?In an extraction procedure, it is advisable to: O put the aqueous layer down the drain put the organic layer in the aqueous waste throw away all layers as soon as you have extracted them save all layers until an experiment is complete