The goal of recrystallization is to obtain the maximum amount of pure material. Explain what effect each of the following mistakes would have on the success of a recrystallization. NOTE: Write complete sentences when answering the questions! Don't just answer "increase" or "decrease"! Provide an explanation to justify your answer! a. Too much solvent was used. What is the effect on the amount of recrystallized material? b. Too little solvent was used. What is the effect on the purity of the recrystallized material?
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- DATA Note: Use the videos as references except when data is provided here. Table 1. Selection of Recrystallizing Solvent. Solvents Dissolution at room temperature? (+ or −) Dissolution at elevated temperature? (+ or −) Distilled water - - Acetone + n/a 95% ethanol - + Toluene + n/a Solid sample: Naphthalene Table 2. Mass Measurements. Mass, g Sample solid 0.5021 Empty watch glass 35.7602 Watch glass with recrystallized sample 36.2485 Table 3. Melting Point Determination. Temperature, oC Appearance of Sample in Capillary Tube … Solid 78.4 Solid 79.3 Solid with signs of liquid 79.9 Solid, liquid 80.6 Liquid, solid 81.3 Liquid with signs of solid … Liquid Theoretical Melting Point, oC: 80.2°C (176.4°F) QUESTIONS Which solvent should be used as the recrystallizing solvent? Check if your chosen solvent satisfies all characteristics of a good…Temperature - distillate volume plot for fractional distillation of benzene (b. pt. 80°C) and toluene (b. pt. 110°C ) The area where toluene is being distilled from the mixture. a. cannot be determined. b. FR1 c. FR3 d. FR22. When performing the recrystallization of an impure solid, why is it advised to use the minimal amount of solvent possible? Group of answer choices To minimize the amount of pure solid lost due to its solubility. To minimize the cost of the recrystallization. To reduce the time needed to filter the pure solid from the solvent after recrystallization. To minimize the amount of hazardous materials used.
- D. Preparation of 3% (vol/vol) Alcohol Solution1. Compute for the volume of denatured ethanol needed to prepare 25 mL of 3% (vol/vol) solution. Note that the concentration of the denatured alcohol stock solution is 98%.2. Explain in detail how the solution will be prepared in the laboratory.Based on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?A rubbing alcohol sample composed of 60% isopropyl alcohol and water was distilled using a simple distillation setup. If the temperature reading is 100°C, what is the composition of the distillate? a. Pure isopropyl alcoholb. Pure waterc. Cannot be determinedd. Water and isopropyl alcohol
- Q1. Give three criteria for a good recrystallization solvent. Q2. You want to purify 10 grams of benzoic acid that has been contaminated with 0.2 g of salicylic acid. You are given the following data: Solubility in water at 20 °C Solubility at 100 °C (g/10 ml) Compound (g/10 ml) Benzoic Acid 0.029 0.680 Salicylic Acid 0.680 0.029 0.22 6.67 a) What volume of Boiling water is needed to dissolve the 10 g of benzoic acid? (show calculations) b) How much benzoic acid will crystallize after cooling to 20 °C (show calculations) c) Will any salicylic acid crystals form? Why or why not? (show calculations/ reason for answer) d) What is the maximum amount of benzoic acid that could be recovered in the first crop of this recrystallization? (Show calculations) e) How can you prove the purity and identity of the purified Benzoic acid?Which of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?
- You are attempting to purify a compound via recrystallization. You prepare the process through the following method: 1) Dissolve the material in a minimal amount of hot EtOH. 2) Slowly add hot water until the compound is slightly cloudy. 3) Add a small amount of EtOH until the solution is just clear (still hot). 4) Cool to RT. Upon cooling to RT you notice that the compound is not precipitating out of solution. You decide to boil off some ethanol. Upon completing this step and cooling to RT you notice that the compound is precipitating out as desired! In which solvent is your compound the least soluble? Ethanol O Water O The ethanol water mixture Insoluble in all of these solvents8. Which is the correct order for a recrystallization procedure?a. solvent selection-dissolving-deposition and collection of crystals-filtration-washing-dryingb. solvent selection-dissolving-filtration-deposition and collection of crystals-washing-dryingc. solvent selection-dissolving-deposition and collection of crystals-washing-filtration-dryingd. solvent selection-dissolving-filtration-washing-deposition and collection of crystals-dryinge. solvent selection-filtration-dissolving-deposition and collection of crystals-washing-dryingIn recrystallization, is it always good to have a high % recovery? Explain. What are the advantages and disadvantages of recrystallization?