Q: Why should the recrystallization solvent have a fairly low boiling point?
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Q: Which of the following solvent systems are not suitable for binary solvent recrystallization?
A: a) water and heptane
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A: We have to write how to increase the yield of steam distillation.
Q: Is recrystallization a good method for purifying any product?
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Q: what is the difference between liquid phase extraction and solid phase extraction
A: A question based on analytical process that is to be accomplished.
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A: A question based on introduction to organic chemistry that is to be accomplished.
Q: Make a schematic diagram of the recrystallization procedure.
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Q: 10. Describe how you can decide whether your recrystallized trphenylmethanol is pure or not ?
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Q: What characteristics does a mixture need to have so that it could be separated by: A) Distillation,…
A: The separation of mixure on the basis of their physical and chemical properties.
Q: Explain the difference between saturated and unsaturatedsolutions.
A: Solution: It can be defined as that the homogeneous mixture of two or more substances. For example:…
Q: You measured the melting point of the recrystallized product Ttal=142,2-145,5°C. Based on this…
A: Given that, Melting point of recrystallized product = 142.2℃ to 145.5℃ .
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Q: Is the separation 100% complete after evaporation process? Explain.
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Q: What are the criteria for a good recrystallization solvent?
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A: A question based on IR spectroscopy, which is to be accomplished.
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A: To do a mixed solvent crystallization, dissolve the solid to be crystallized in the smallest amount…
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Q: At what step in the recrystallization process would a colored impurity be removed?
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Q: A melting "point" analysis is a bit of a misnomer: how so? What do we measure when doing such an…
A: By the term melting point, we mean that it is a fixed point of temperature where a substance or…
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Q: If we are recrystallizing a PURE compound, what will happen to the sample if we cool the solution…
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Q: Classify these solvents as either protic or aprotic solvents.
A: A protic solvent is a compound containing at least one hydrogen atom bonded to anelectronegative…
Q: Contrast the physical appearance of the crude material before the recrystallization and that of the…
A: A question based on re-crystallization, which is to be accomplished.
Q: Question: How to get rid of colored impurities in the recrystallization process? Explain that in…
A: Recrystallization is a chemical purification process. By dissolving all impurities and a compound in…
Q: Why is it important to cool slowly during recrystallization
A: recrystallization is a process in which we dissolve an impure crystal in a solvent at high…
Q: After acid-base extraction why is it important to wash organic layer at least once with pure water?
A: A question based on quantitative analysis, which is to be accomplished.
Q: You are tasked with performing a recrystallization. You have 3 potential solvents to use, but you…
A: The solution is given below -
Q: During melting point determination, what does melting point range means? How will you know if the…
A: The melting point of a solid substance is the temperature at which it changes from solid state to…
Q: 2. Is it possible to purify a compound by recrystallization using a mixture of solvents? Why or why…
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Q: What are the common faults in the Water distiller instrument?
A: You'll need to clean the boiling chamber on a regular basis to maintain your water distiller running…
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A: Recrystallization is a process of purifying a solute when it is soluble in the solvent only on…
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Q: What properties should ideally be possessed by a recrystallization solvent?
A:
Q: Draw flow chart for the extraction of mixture containing a. Acid and Base
A: Given : mixture of an acid and base. To find : Draw a flow chart of acid base extraction. Solution…
Q: Why is 95% alcohol a good solvent for extraction?
A: The substance which is present in lesser amount is termed as solute. The substance which is present…
Q: Describe the procedure of how to collect and dry your newly recrystallized compound.
A: Recrystallization is the method that is used to purify the organic compounds. It involves the…
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- Explain why it is incorrect to collect data for temperatures above 100 C in terms of the solute to solvent ratio. Table 1: Temperature VS. solubility data for ammonium chloride. Test tube # g NH4Cl/10 mL H2O Crystallization temp. (ºC) 1 1.0 g/10 mL H2O 10 oC 2 1.8 g/10 mL H2O 20 oC 3 2.9 g/10 mL H2O 40 oC 4 3.8 g/10 mL H2O 65 oC 5 4.4 g/10 mL H2O 95 oCThe standard addition method is used to analyze a sample of a river water for mercury. Solution A is made by pipetting 5.00 mL of undiluted sample in to a 10 mL volumetric flask and filling to the mark with DI water. Solution B is made by pipetting 5.00 mL of undiluted sample and 3.00 mL of 15.0 ppb of Hg standard into same 10.0 mL volumetric flask and filling to the mark with DI. Solution A and B are analyzed using atomic absorption spectroscopy and give a percent transmittance values of 56 % and 33 % respectively (not blank corrected). A blank has a transmittance of 96%. What is the corrected absorbance of both solution A and B? A. Solution A: 0.123 Solution B: 0.463 B. Solution A: 0.463 Solution B: 0.234 C. Solution A: 0.123 Solution B: 0.234 D. Solution A: 0.234 Solution B: 0.463A binary mixture of benzene and toluene containing 57.47 mol% benzene is continuously distilled. The distillate contains 90.40 mol% benzene, while the bottom product contains 86.96 mol% toluene. What molar flow rate of the bottom product will correspond to 183.11 mol/h of the distillate product? Type your answer in mol/h, 2 decimal places.
- Extraction of Caffeine Post-lab 8. Ethanol is miscible with water. (After all, alcoholic beverages don t separate into an “alcohol‟layer” and a “water layer.”) Assuming that caffeine is soluble in ethanol, could you useethanol as a solvent to extract caffeine from coffee (rather than using dichloromethane asthe extraction solvent)? Explain why or why not. 9. A 12 oz can of Coke contains 46 mg of caffeine. One fluid ounce is equivalent to 29.57 mL(1 oz = 29.57 mL). What is the concentration of caffeine in Coke, in units of mg/mL? Showyour work. 10. What is an alkaloid?You are given the suggestion that a 0.15 ppm quinine aqueous solution is a good concentration to shoot for in the experiments, but quinine fluoresces best when it is acidified to 0.10 M H2SO4. Describe how to make 100 mL of the recommended solution starting with quinine sulfate (actually, quinine hemisulfate salt monohydrate). Assume you also have 1.0 M sulfuric acid and de-ionized water. Describe the process of a substance undergoing fluorescence and compare to the process of phosphorescence.You are given the suggestion that a 0.15 ppm quinine aqueous solution is a good concentration to shoot for in the experiments, but quinine fluoresces best when it is acidified to 0.10 M H2SO4. Describe how to make 100 mL of the recommended solution starting with quinine sulfate (actually, quinine hemisulfate salt monohydrate). Assume you also have 1.0 M sulfuric acid and de-ionized water.
- Calculate how many grams of phthalic acid remained in the chilled water (the “mother liquor”) based on the solubility data given (show your work). You will recrystallize phthalic acid, a compound that is used to manufacture synthetic polymers and perfumes. Phthalic acid is very soluble in boiling water, 18 g/100 mL, and is much less soluble in chilled (14°C) water, 0.54 g/100 mL. Thus, water is a very good recrystallization solvent for phthalic acid. 54.8% percent recovery was calculatedGypsum (CaSO4) is a common percipitant in water desalination. CaSO4 <=> Ca2+ + SO42- where Ksp=10-4.6. Assuming that: [Ca2+]=2x10-2 M; [SO42-]=2x10-3M: a) Find Qsp or IAP for the given water b) Find the solubility index (SI) and determine whether CaSO4 is under, super, or at saturation in water. Feel free to make any assumptions you wish, as long as they're stated.10g coffee 4g sodium carbonate 40m dichloromethane 160ml distilled water coffee filter What are the principles behind caffeine being extracted from coffee using the above items? 1st sodium carbonate mixed with coffee then brought to a boil for 20min then solution/grinds are filtered. Then solution is added to a separatory funnel with 15ml of dichloromethane and two layers are observed so the bottom layer with DCM contains the caffeine, then this layer is collected in a beaker and dried out using molecular seeds. Then the solvent is brought to a boil with crude caffeine remaining and recystallized using 95% ethanol and brought to a boil again. Then the contents are vaccum filtered and allowed to dry resulting in 30mg caffeine.
- During the distillation of the Bromobenzene and water mixture which fraction is richer in Bromobenzene: a) First fraction b) Second fraction c) The last fraction d) All fractions have the same compositionA student dissolved 20 mg of caffeine in 20 mL of water. The student carried out two extractions using 20 mL of dichloromethane in each one. Caffeine solubility in water: 2.17 g / 100 mL at 25 ° C Caffeine solubility in dichloromethane: 10.0 g / 100 mL at 25 ° C Present the calculations in detail below. A. Determine the distribution coefficient. b. Determine the amount of caffeine obtained in the first extraction. C. Determine the amount of caffeine obtained in the second extraction. 77 D. Determine the total amount of caffeine extracted during the entire process. and E.Determine the percent recovery.Which statement about liquid-liquid extraction is not correct? * A- A solvent must be available that is miscible with the solution containing the substance to be extracted. B- The solvent used for extraction must have a good ability to dissolve the desired substance. C- The denser solution forms the bottom layer in the extraction funnel. D- The extraction funnel must be vented during the extraction procedure to prevent excessive build-up of pressure inside the extraction funnel. E- All these statements are correct.