Calculate the maximum amount of ethyl salicylate that could form from the amounts of starting material you used. Report the amount in mol and g units. That amount is called theoretical yield, use it to determine the percent yield you obtained. Observations and measurements Salicylic acid (g) Ethanol (mL) Weight flask and stir bar (g) Weight flask, stir bar and product (g) Ferric hydroxamate test color Observations or measurements 0.2354 4mL 26. 35959 26.89649 Purple €
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- 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?When the compounds analyzed by Robrob were passed on to the next test, another scientist, Kikoko, needed to determine the molecular weight of the ctive compound. They created a solution with a concentration of 20.0%w/w from the solid active compound and the solution had a density of 1.40 g/mL. From this solution, 10µL was taken and mixed with 190µL of reagent and water. It was analyzed and showed a concentration of 5x10-4 M compound. a. What is the concentration (in molarity) of the 20%w/w solution? b. Why was the concentration of the solution expressed as %w/w initially? c. What is the molecular weight of the active compound?Complete the reagent table (check procedure for acid concentration) and calculate the theoretical yield. Calculate/discuss the percent yield. How efficient was the reaction? Are there any key areas in this experiment that caused a significant drop in yield? [Discussing how product was lost in the reaction rather lost in transfer steps will get the most points here] Information: 11 mmol of 2-methylcyclohexanol. 1.3 mL of 9 M sulfuric acid. Actual Yield: 0.626 grams.
- 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.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.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.
- of loui tomson - Bing InvpAfSmo g/iewfo In a distillation process, a sudden formation of vapor might happen when heat is concentrated in one area which results in spattering. All of the following are methods to prevent this EXCEPT * Placing boiling stones or chips into the container. Placing thin capillary tubes into the container. Keeping the container in a steady position. Placing a stirring rod into the container. The residue in the above process is transferred into the beaker with the aid of water. The color of the solution is black brown O gray blueWhich of the following error will make the reported percent yield of Srli0a)2 too high? 1, Because of the porosity of the filter paper, some of the SrINO3)2 precipitate passes through the filter paper. IL. The drying oven, although thought (and assumed) to be set at 125°C, had an inside temperature of 54C III. Product is leaving in the oven (125°C) for 20 min instead of 10 min before measuring. All three I only only Om only None of the three In the Chemistry of Copper expeiment, starting mass of copper is 0.020g. If the percent recovery is 95%, what is the mass of Cu metal obtained at the end of the experiment? QUESTION 14 95.00 g O 0,950 8 O0.198 0.020 O 0.0198When 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
- Which of the following statements is true? After drying a sample in the oven, you can place it immediately inside the analytical balance. In weighing hygroscopic substances, containers should always be kept close when not in use. Place solid reagents / precipitates directly on top of the balance pan. Liquids can be weighed using a weighing paper.133 107 ethyl ether ethyl alcohol 80 53 water 27 ethylene glycol 20 40 60 80 100 120 Temperature (°C) University of Wisconsin, https://wisc.pb.unizin.org/minimisgenchem/chapter/vapor-pressure-m10q3/ Reference the vapor pressure diagram above with the table below, which provides the chemical formulas for the fourubctancoc Pressure (kPa)1.063 g of p-acetamidophenol was measured out into a 50 mL round bottom flask along with 8 mL of 1M NaOH in ethanol and a stir bar. This mixture was heated at reflux for 15 min. It was allowed to cool and then 0.80 mL of bromoethane was added to the reaction. The mixture was then heated at reflux for another 15 min. After heating, the solution was poured onto a mixture of ice and water and further cooled on ice and then the solid was collected by vacuum filtration. This solid was then recrystallized from ethanol and water. The final mass of the purified phenacetin was 0.42250 g and it had a melting point of 127 - 130 C. The TLC plate shows (from left to right) pure p-acetamidophenol, the reaction mixture before pouring it on ice/water, phenacetin after recrystallization. The solvent used was a mixture of 80% ethyl acetate and 20% heptane with 0.5% acetic acid added. QUESTION: Using the given TLC plate can you describe the results and what does the TCL plate tell about the purity?