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Benzocaine experiment
1. Why was a mixture of CH3OH / H2O used for recrystallization of the crude instead of using only CH3OH?
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- Experiment 6- Milk Objective: 1. Identify the different physical properties of milk. 2. Determine the different constituents of milk. Apparatuses: test tubes, test tube rack, test tube holder, tripod, wire gauze, graduated cylinder, dropper, beaker, watch glass Materials: evaporated milk, litmus paper, filter paper, dilute NaOH solution, Cuso, solution, acetic acid, Benedict's solution, ammonium molybdate solution, AGNO, solution, BaCi, solufion, KCo, solution Mik is an emulsion of fat globules and suspension of casein micelles (Ca, casein, P), all of which are suspended in an aqueous solution. Mik is the only single food that possesses many nutritional values. However, it still cannot be considered as a complete single food because it lacks iron and copper, among other essential nutrients. The proteins are caseins (about 80%), lactalbumin, and lactoglobulin. The fat contains fatty acids ranging from C, to C Other lipids include cholesterol and phospholipids. Lactose constitutes the…Can you proceed with sample analysis even without standardizing the titrant solution? Why or why not? You have finished two trials of the sample analysis for the experiment and you noticed that the burette is almost empty (~5 mL remaining). Should you add more titrant before the next sample analysis or not? Why or why not?Extraction of Caffeine Post-lab 1. What group of organic compounds does caffeine belong to? 2. Draw the structure of caffeine as a line formula. Redraw the structure of caffeine,showing all carbon and hydrogen atoms. 3. What is the molecular formula for caffeine? Use the molecular formula of caffeine tocalculate its molecular weight. 4. What does it mean for two solvents to be immiscible? 5. On the report sheet, you calculated your percent recovery of caffeine. a. If your percent was less than 90%, give at least one reason why it was less. b. A group of students have their percent yield more than 100%, give at least one reasonwhy it was more than 100%. Do NOT simply say “human error.” Be specific about the typesof errors (human or otherwise) that may have occurred, leading to a recovery more than eorequal to 100% (Is this possible Why?) 6. Based on what you observed during this experiment, is dichloromethane denser OR lessdense than water? Explain your reasoning. 7. Based on what…
- 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?Answer if true or false , if false, put the correct answer 1. Good primary standard needs to have side reactions 2. Buret is used to contain analyte 3. What are the 5 types of trytimetryPlease help. Questions in images. Solvent Rf of A Rf of B Rf of C 10% ethyl acetate-90% hexanes .12 .07 .01 20% ethyl acetate-80% hexanes .34 .29 .10 30% ethyl acetate-70% hexanes .53 .42 .22 40% ethyl acetate-60% hexanes .72 .61 .35
- For the boxes on top of the arrow, fill in the reagent(s) and solvent(s). Tf- 1. HQ. 2.Chromatography question A student properly sets up a column chromatography experiment. Although the mixture is soluble i the mobile phase, the sample appears "stuck" at the top of the column and will not elute eregardless of how much solvet is pplaied. what could bee the cause of this issue and what could teh student try to achieve a successful separation?The surface of the silica gel has a structure that looks like this diagram below. Suppose you used a plate coated with silica gel, with propanone, CH3COCH3, as the solvent for thin-layer chromatography. Sno Suppose also that the mixture you were trying to identify contained • benzaldehyde •benzanilide • phenol 1) rank the Rf Value from large to small 2) name the IMF between each compound and the silica gel OH OH main body of silica structure
- In the second test, you will prepare 10 mL of each solution containing 0.1%, 0.2%, 0.5%, 0.8%, 1%, 5%, and 10% H2O2. Explain how this will be done using a 10% stock solution of H2O2 to prepare the 5 % solution and a stock solution of 1 % H2O2 to prepare the remainingExplain why different results are observed when HCl and H2SO4 are added to brine?Which error will lead to negative deviation from the theoretical Keq? a. cuvette was filled to the brim with the sample. b. cuvette was washed with sodium hydroxide instead of distilled water. C. standard with the highest concentration was used in autozero. d. cuvette was misplaced such that the opaque side faces the light