Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. Will the aqueous layer be the upper layer or the lower layer?
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- Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel.
- Will the aqueous layer be the upper layer or the lower layer?
- If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?
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- 4-bromobenzoic acid (1.0 g) is dissolved in 20 ml dichloromethane. After addition to a separatory funnel, the dichloromethane solution is treated with 20 ml 3.0 M NaOH solution. After the layers are separated, which layer(s) will contain an organic compound (non-solvent)? What would happen if the aqueous layer is treated with 20 ml 3.0 M HCl?You were given a mixture of two miscible solvent A and B that you are tasked to separate. You know that solvent A has a boiling point of 49 oC while solvent B has a boiling point of 174 oC. Which of the listed method would overall be the most efficient? Fractional distillation Recrystallization Solid-liquid extraction Liquid-liquid extraction Simple distillation Acid-Base extractionThe melting temperature of pure acetylsalicylic acid is 135 degrees Celsius. Based on the results of the melting temperature test, what is the percent purity of your sample of aspirin? Part I Synthesis of Aspirin Mass of salicylic acid used (g) 2.029g Volume of acetic anhydride used (mL) 5ml Mass of acetic anhydride used (vol. × 1.08 g/mL) 5.4g Mass of aspirin synthesized (g) 3.256g Part II Melting Temperature Data Melting temperature (°C) 133°C Part III Salicylic Acid Standard Stock Solution Initial mass of salicylic acid (g) 0.210g Moles of salicylic acid (mol) 0.0147 mol Initial molarity of salicylic acid (M) 0.724 M Part III Beer’s Law Data for Salicylic Acid Standard Solutions Trial Concentration (M) Absorbance 1 10 0.301 2 7.5 0.219 3 5.0 0.163 4 2.5 0.074 Best-fit line equation for the salicylic acid standards Test of the Purity of the…
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- You have 100 mL of an organic acid solution in water which contains 0.30 g acid. The distribution coefficient of the acid in the ether is close to 10. Calculate the amount of acid that would be left in water after four 20-mL extraction with ether. Do the same calculation using one 80-mL extraction with ether to determine which method is more efficient.1,4‐Dimethoxybenzene (0.642 g) was dissolved in 2.0 mL acetic acid in a 25 mL Erlenmeyer flask using heat from a hot plate. Once the solid dissolved, 1.0 mL tert‐ butanol was added, and the reaction mixture was cooled in an ice bath. Then 2.0 mL concentrated sulfuric acid was added in 2‐3 drop portions,stirring the mixture after each aliquot. After the addition, the flask was removed from the ice bath and allowed to sit at room temperature for 15 minutes. Then 1.0 mL water was added dropwise to dilute the acid and the reaction mixture was added to 40 mL cold water in a 100 mL beaker. The solid was vacuum filtered and washed with 5 mL cold water, giving 52 g filtrate. The product wasrecrystallized from 4.5 mL methanol, yielding 0.317 g purified 1,4‐di‐tert‐butyl‐2,5‐dimethoxy benzene (27.2% yield). What is the atom economy, e-factor, and effective mass yield?A chemist is asked to separate the components of a mixture composed of 1.00 g each of the two compounds shown below. The chemist has access to the following bases: 10% aqueous NaHCO3 and 10% aqueous NaOH. Which base and how many mLs of the base (i.e., the minimum amount) are needed to completely separate these compounds from each other by liquid-liquid extraction?
- You have an aqueous solution of pyridinium chloride (C6H5N'HCI) and you want to extract it with a second solvent where it would be more soluble. Which of the following should you do to accomplish the said task? Mix 3M NaOH, acetone, and the aqueous layer in a separatory funnel, shake, release build-up pressure, return to A stand, and let the mixture separate into two layers. Mix methanol and the aqueous layer in a separatory funnel, shake, release build-up pressure, return to stand, and let the mixture separate into two layers. Mix 3M NaOH, toluene, and the aqueous layer in a separatory funnel, shake, release build-up pressure, return to stand, and let the mixture separate into two layers. Mix dichloromethane and the aqueous layer in a separatory funnel, shake, release build-up pressure, return to stand, D and let the mixture separate into two layers.Table 1. Solubility Tests. Functional Group Observations (specify type if any) Sample in concentrated (+/-) H2SO4 Color orange Hydroxyl group Hydroxyl group Hydroxyl group 1-butanol Color orange 2-butanol Color orange diisopropyl ether Look at the structures of compounds tested for solubility in concentrated H2SO4. What generalization can be made for a substance to be soluble in concentrated H2SO4 ?Carboxylic acids, including fatty acids and benzoic acids, are often present in both municipal and industrial effluents. Describe a sample preparation combined with GC method for identification and determination of carboxylic acids in raw wastewater at ppb (ug L-1) level. Point out a suitable sample preparation technique and GC conditions in details and give justifications for your choice. ОН HO, Heptanoic acid Benzoic acid HO ÇH3 ОН H3C CH3 4-Methylbenzoic acid 2,4-Dimethylbenzoic acid