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- 1. Using a burette, measure the cyclohexene (6.0 mmol) and transfer to a 125 mL erlenmeyer, along with acetone ([Cyclohexene] = 1 M). Add a stirbar. 2. Cool the solution in an ice-bath for 10 minutes with magnetic stirring. 3. Meanwhile, in a 2nd 125 mL erlenmeyer, dissolve Oxone (15.6 mmol) in deionized water ([Oxone] = 0.60 M). 4. Attach a ring-clamp right over your flask. Add a closed separatory funnel, such that the bottom tip is partially inserted in the flask. 5. Add your Oxone solution into the separatory funnel. 6. When your cyclohexene solution is sufficiently cold, gently open the bottom valve of the separatory funnel to add the Oxone solution. Adjust the valve to obtain a flow of approximately 1–2 drops/second. 7. Once the addition is complete, rinse the separatory funnel with a few millilitres of water. 8. Remove the flask from the ice bath, and allow the reaction to stir at room temperature for 20 minutes. 9. After 20 minutes, add 12.5 M HCI (14.9 mmol) dropwise to the…1. Using a burette, measure the cyclohexene (6.0 mmol) and transfer to a 125 mL erlenmeyer, along with acetone ([Cyclohexene] = 1 M). Add a stirbar. %3D a) How much acetone is required for the reaction?Really hoping for solutions since I’m having a hard time with this. Pls. skip if unsure or not willing to answer the subitems (these are all connected for one item). Thanks in advanced. When the compounds analyzed by Robrob were passed on to the next test, anotherscientist, Kikoko, needed to determine the molecular weight of the active 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?
- 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?Given your choice of Flame AA, ICP-AE, XRF, El-MS, or none of these, and keeping in mind that cost matters, which would you use a. for a nondestructive measurement of a sample? b. to determine 10ppm Zn in a solution? c. to determine the amount of Br in a mixture of KBr. KCL and KI? d. to determine the number of Bratoms in a molecule of an organic liquid? e. to determine 10ppb of Fe in motor oil?Which of the followings is the important feature for choosing a good solvent for any recrystallization? O a. The compound of interest should be soluble in the solvent at high temperatures, but insoluble at room temperatures o b. c. The compound of interest should be insoluble in the solvent at high temperatures, but soluble at room temperatures O d. The compound of interest should be soluble in the solvent at all temperatures O E. The impurities must be insoluble in the solvent at high temperature
- Questions 1. Which are the impurities that indicate the substandard preparation? 2. Why does the reaction have to be carried out in nitric acid? 3. What are the differences of limit test for purified water in bulk and purified water in containers? 4. Which impurities that the limit test using comparison method? 5. What is the essential equipment for limit test using comparison method? And what is the specific specification of this equipment? 6. Which test has been conducted based on the principle of redox reaction? 7. Which test(s) has been conducted based on the principle of semi-quantitative?Provide details about the reaction workup. 4,4'-DIBROMOBIPHENYL [Biphenyl, 4,4'-dibromo-] Submitted by Robert E. Buckles and Norris G. Wheeler1. Checked by R. S. Schreiber, Wm. Bradley Reid, Jr., and Robert W. Jackson. 1. Procedure In a 15-cm. evaporating dish is placed 15.4 g. (0.10 mole) of finely powdered biphenyl (Note 1). The dish is set on a porcelain rack in a 30-cm. desiccator with a 10-cm. evaporating dish under the rack containing 39 g. (12 ml., 0.24 mole) of bromine. The desiccator is closed, but a very small opening is provided for the escape of hydrogen bromide (Note 2). The biphenyl is left in contact with the bromine vapor for 8 hours (or overnight). The orange solid is then removed from the desiccator and allowed to stand in the air under a hood for at least 4 hours (Note 3). At this point, the product weighs about 30 g. and has a melting point in the neighborhood of 152°. The crude 4,4'-dibromobiphenyl is dissolved in 75 ml. of benzene, filtered, and cooled to 15°.…02:21 4G File Details 4CH003/UM1: Fundamentals of... Introduction Perhaps the cleanest method of conducting an oxidation is by catalytic oxidation, since this minimizes the problem of removal of unwanted by- products. However, the conditions used are often vigorous and require the use of specialized equipment. By comparison, the product of a "chemical" oxidation may be more difficult to purify due to the presence of the reduced form of the oxidizing agent and potential "tars" that may arise from "over- oxidation". Because chemical oxidation can be carried out using conventional equipment they are more popular. dissolving sodium or potassium dichromate in acid is a commonly used oxidizing agent, being classed as a relatively powerful oxidant and having water soluble by-products (Cr III salts). Sulphuric acid is generally used if the material to be oxidized is water soluble and glacial acetic acid is used if it is Chromic acid, prepared in-situ by not. Alcohols are readily oxidized to…
- Which of the following could DECREASE the amount of the recovered crystals in the purification by recrystallization experiment? Collecting the recrystallized benzoic acid by filtration using a pre-weighed filter paper. Using a long-stemmed funnel in the hot filtration step. Cooling the filtered solution rapidly. Washing the recovered crystals using hot solvent. a. II, III b. II, IV c. II, III, IV d. I, II, III, IVTable 2. Calculations ~60°C trial ~50°C trial ~40°C trial ~30°C trial ~20°C trial Vol. of HCI used (mL) 19.87 12.93 12.37 9.03 6.30 Moles of HCI used (mol) 9.94 6.47 6.19 4.52 3.15 Moles of borate present (mol) [Borate] (M) Ksp In(Ksp) 1/T (K-1)Screen Shot 20... View Zoom Share Search 1. Using a burette, measure the cyclohexene (6.0 mmol) and transfer to a 125 mL erlenmeyer, along with acetone ([Cyclohexene] = 1 M). Add a stirbar. 2. Cool the solution in an ice-bath for 10 minutes with magnetic stirring. 3. Meanwhile, in a 2nd 125 mL erlenmeyer, dissolve Oxone (15.6 mmol) in deionized water ([Oxone] = 0.60 M). 4. Attach a ring-clamp right over your flask. Add a closed separatory funnel, such that the bottom tip is partially inserted in the flask. 5. Add your Oxone solution into the separatory funnel. 6. When your cyclohexene solution is sufficiently cold, gently open the bottom valve of the separatory funnel to add the Oxone solution. Adjust the valve to obtain a flow of approximately 1–2 drops/second. 7. Once the addition is complete, rinse the separatory funnel with a few millilitres of water. 8. Remove the flask from the ice bath, and allow the reaction to stir at room temperature for 20 minutes. 9. After 20 minutes, add…