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?
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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?
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- Which of the following statements is false in a simple and steam distillation? Simple distillation can help in separating homogenous mixtures of 1-propanol (BP of 97 °C) and propanone (BP of 56 °C) A liquid with high boiling point that decomposes on simple distillation may not be steam distilled for its purification. Steam distillation can help in separating immiscible mixtures with wide difference in boiling point. Simple distillation uses a homogeneous mixture while steam distillation separates heterogeneous mixture.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 mixture contains benzoic acid, 2-napthol, and naphthalene. Dissolve the mixture in the polar solvent ether. When you react the mixture with 10% NaHCO3(sodium bicarbonatea weak base in aqueous solution) reacts with benzoic acid and forms sodium benzoate an ionic compound (similar to NaCl) that dissolves in aqueous solution (heavier than ether in density) and goes to the bottom of the centrifuge tube or to the bottom of the separatory funnel forming two layers. Then remove the bottom aqueous layer and collect in a beaker labeled as bicarbonate extract. Acidify the bicarbonate extract in the beaker to give benzoic acid. The top ethereal layer contains in the centrifuge tube or separatory funnel 2-napthol and naphthalene. To this top layer add 10% NaOH (sodium hydroxideis a strong base in aqueous solution reacts with only 2-napthol, a weak acid forming 2-napthoxide an ionic compound soluble in aqueous solution (similar to NaCl) that goes to the bottom of the centrifuge tube or to…
- Which of the following statements is written incorrectly? Benzophenone (1.0 g) was dissolved in 10 mL of hexanes. Benzophenone (1.0 g, 5.5 x 10-3 mol) was dissolved in hexanes (10 mL). Benzophenone (1.0 g, 5.5 mmol) was dissolved in hexanes (10 mL). Benzophenone (1.0 g, 0.0055 mol) was dissolved in hexanes (10 mL).A group was given the responsibility of performing a recrystallization experiment in their laboratory to see if the three newly found solvents could purify and separate a mixture including compounds A and B. The following are the solubilities of the two compounds in g/100 mL of hot and cold solvents: Solubility in g/100 mL solvent A B Solvent Hot Cold Hot Cold 1 4.60 1.10 5.30 1.90 2 6.40 5.80 8.40 1.10 3 9.70 3.30 6.80 1.70 What is the %recovery and %purity of A and B in the chosen solvent? Show solutions plsEmmett, a sophomore chemistry major, was trying to separate an unknown mixture. His instructor told him that there was a carboxylic acid, phenol, and amine present in the mixture. He dissolved 3 g of the unknown in 10 ml of t-butyl methyl ether. He then added 10 ml of 3M sodium hydroxide to the mixture. He used a separatory funnel to separate the layers and collected the aqueous layer in an Erlenmeyer flask labeled fraction 1. Then he added 10 ml of 1.5M sodium bicarbonate to the remaining ether. He separated the layers, and collected the aqueous layer in an Erlenmeyer flask labeled fraction 2. Finally he added 10 ml of 1.5 M hydrochloric acid to the ether, and separated the aqueous later in an Erlenmeyer flask labeled fraction 3. Emmett neutralized the respective fractions. He obtained precipitate in fraction 1, and fraction 3. He ran an IR of the solid obtained in fraction 1 and saw a broad absorption at 3500-3300 cm-1 and a sharp absorption at 1710 cm-1. Fraction 3 showed…
- How do you prepare this solution? 10ml of 20% (w/v) L-arabinose stock (weight/volume). How much of L-arabinose and water do you need to prepare desired arabinose stockWhen 50 cm3 of hydrochloric acid of concentration 2.0 mol dm−3 is added to 50 cm3 ofsodium hydroxide solution of concentration 2.0 mol dm−3, the temperature increase is 13.0 qC.HCl(aq) + NaOH(aq) NaCl(aq) + H2O(l) The experiment is repeated using 25 cm3 of the same hydrochloric acid and 50 cm3 ofthe same sodium hydroxide solution. What is the temperature increase?3. Suppose you have a mixture of saturated aqueous sodium chloride (brine) and your 2-chloro-2-methylbutane product in a separatory funnel. Use densities to predict which phase will be the top layer in the funnel. a. 2-chloro-2-methylbutane (organic phase) b. saturated sodium chloride (aqueous phase) c. hard to predict since densities are both very close to 1.18 g/mL d. there would only be one phase since the substances are miscible
- Which of the following is more likely to be soluble in benzene (C6H6)? In each case, explain your answer. a. CC14 or NaCl b. hexane (C6H14) or glycerol (CH2OHCHOHCH2OH) c. acetic acid (CH3COOH) or heptanoic acid (C6H13COOH) d. HCl or propylchloride (CH3CH2CH2Cl)0.750 g of crude acetylsalicylic acid is recrystallized using ethanol as the solvent. The solubility of acetylsalicylic acid in ethanol at 78 oC is 15.45 g per 100 mL. a) How much hot ethanol is needed to dissolve the 0.750 g of acetylsalicylic acid? b) If the solubility of acetylsalicylic acid at 25 oC is 0.100 g per 100 mL, how much acetylsalicylic acid will be obtained after crystallization in ethanol at 25 oC? Use the volume from part A. c) What is the maximum percent recovery for this re-crystallizationDuring your first day on the job as a research assistant, you are preparing 50 mL of hybridization solution with the following components and working concentrations: 50% formamide 5X sodium salt citrate 0.5% sodium dodecyl sulfate You start from the following concentrated stock solutions: 100% formamide 20X sodium salt citrate 20% sodium dodecyl sulfate How much of each concentrated stock solution and water will you add?