1. Identify and explain which solvents can be used from the list below to perform the...
1.
Identify and explain which solvents can be used from the list below to perform the extraction described in this experiment.
Ethanol
Acetone
Diethyl ether
Methylene chloride
Benzene
Toluene
Methanol
Carbon tetrachloride
Acetic acid
2-propanol
2. An aqueous solution of a dye with molar extinction coefficient of 60,000, has an absorbance of 0.8 when a 1 cm cuvette is used. Calculate the concentration of the dye using Beer’s Law. (MW of the dye = 374)
3. A 20 mL portion of the solution from question 2 is extracted with 20 mL of ethyl acetate. After extraction, the aqueous layer has an absorbance of 0.2.
a. calculate the value of the distribution coefficient
b. calculate the concentration of the dye (in g/mL) left in the aqueous layer.
Homework Answers
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1.
Identify and explain which solvents can be used from the list
below to perform the...
2. For each solvent, indicate if it is miscible with each other solvent. If it is...
2. For each solvent, indicate if it is miscible with each other solvent. If it is miscible, put an "M" in the box If it is not miscible, put and "X" in the box. methylene chloride diethyl ether acetone chloroform ethyl acetate water methylene chloride ethyl acetate diethyl ether chloroform 3. Brine (aqueous NaCl solution) is often used in extraction procedures. The concentration of a saturated brine solution is 358 g of NaCl in 1.00 kg of water giving a...
You have a separatory funnel that contains a solution of 4-methyl benzoic acid and ethoxybenzene in...
You have a separatory funnel that contains a solution of 4-methyl benzoic acid and ethoxybenzene in methylene chloride. By adding KOH (aq) into this solution for extraction, what compound(s) would be expected to form in the aqueous layer? Write the equation. Compound X has a hexane/water distribution coefficient of 2.0. (a) Does compound X have a higher or lower solubility in hexane comparing to water? (b) How much of a 3.0 g sample of compound X dissolved in 100 ml...
Acid/Base Extraction 1. Provide a flow chart detailing the acid/base extraction/separation of the compounds shown below....
Acid/Base Extraction
1. Provide a flow chart detailing the acid/base
extraction/separation of the compounds shown below. Your answer
must employ the following reagents: methylene chloride,
hydrochloric acid (1M & 6M), sodium hydroxide (1M & 6M),
10% sodium bicarbonate (aq). Clearly indicate the product(s) and
layers formed following each step of your separation scheme.
IMPORTANT: p-cresol is soluble in sodium hydroxide solution but
insoluble in neutral water or sodium bicarbonate solution. 2-
ethylbenzoic acid is soluble in both sodium hydroxide and...
Provide a flow chart detailing the acid/base extraction/separation of the compounds show below. Your answer must...
Provide a flow chart detailing the acid/base extraction/separation of the compounds show below. Your answer must employ the following reagents: methylene chloride, hydrochloric acid (1M & 6M), sodium hydroxide (1M & 6M), 10% sodium bicarbonate (aq). Clearly indicate the product(s) and layers formed following each step of your separation scheme. IMPORTANT: p-cresol is soluble in sodium hydroxide solution but insoluble in neutral water or sodium bicarbonate solution. 2-ethylbenzoic acid is soluble in both sodium hydroxide and sodium bicarbonate solutions. Use...
Using your notetbook (which should have any equaitons/tables/ vital information) answer the questions below. Showing ALL...
Using your notetbook (which should have any equaitons/tables/ vital information) answer the questions below. Showing ALL math when needed. (20 pts) 1. The pain reliever phenacetin is soluble in cold water to an extent of 1.0 g/1310 ml and soluble in diethyl ether to an exient of 1.0 g/90ml. Determine the approximate distribution coefficient for phenacetin in those two solvents. (6 pts) 2. Why must the stopper be removed from the separatory funnel before the lower layer is removed? (4...
Part A 1. If you had used more methylene chloride in each step, you could have...
Part A 1. If you had used more methylene chloride in each step, you could have extracted more caffeine. Explain why you did not. Hint - What step would have taken longer (Hint: not drying). PART A Mass of Beaker & Caffeine Mass of Beaker 167.750g 67.6809 Mass of Caffeine 0.0 75 Calculations. Show your work and circle the answers. Mass of caffeine recovered: 012919 b) Actual:.07 % caffeine recovered: a) Predicted: 9 7:213% b) Actual: 92.105% PART B Unknown...
1) Explain how saturated NaCl solution would help draw the water away from the organic layer in the emulsion layer....
1) Explain how saturated NaCl solution would help draw the water away from the organic layer in the emulsion layer. 2) You have a solution of 30 mg of caffeine dissolved in 100 mL of water. The partition coefficient for aqueous caffeine extracted with Dichloromethane (CH2C12) is 4.6. Show all work for the following calculations: a. Calculate the total mg extracted by using a single 30 mL portion of dichloromethane. b. Calculate the total mg extracted by using a three...
experiment-2-coffeine-extraction-l.pdf
Introduction: Pre-lab Questions Turn in typed responses in the beginning of lab. Answer in complete sentences. Show your work in pen where applicable. 1. What other compounds are extracted along with caffeine into the tea? Use what you know about the relative polarity of the functional groups within these compounds to determine the final destination of the following compounds: cellulose, tannins, chlorophylls, sodium carbonate. Do the majority of these compounds end up in the tea bag, filtered solid, aqueous layer,...
pre-laboratory Questions A 1 Explain why it is more efficient to make several extractions using small...
pre-laboratory Questions A 1 Explain why it is more efficient to make several extractions using small portions rather than one extraction using the same total volume. 2 Define the following terms: Drying agent intensity Drying agent capacity 3 Select the upper layer in each pair of mixed solvents (see Appendix C): Water and benzene Water and carbon tetrachloride Water and ether 4 Write an equation for the reaction of a benzoic acid with aqueous sodium bicarbonate. 5 Complete the following...
1-) Silica gel has a bulk density of about 0.3 g/cm3, so 15 g would occupy...
1-) Silica gel has a bulk density of about 0.3 g/cm3, so 15 g would occupy a volume of 45-50 cm3 (45-50 mL). This quantity is called the: 2-) You are carrying out a chromatographic separation on a 15 mg sample using 6.5 g of silica gel in your column. If you aim for a column height of 10 cm of silica gel, what is the inside diameter of the necessary chromatography column in units of cm? 3-) Consider the...
2. For each solvent, indicate if it is miscible with each other solvent. If it is miscible, put an "M" in the box If it is not miscible, put and "X" in the box. methylene chloride diethyl ether acetone chloroform ethyl acetate water methylene chloride ethyl acetate diethyl ether chloroform 3. Brine (aqueous NaCl solution) is often used in extraction procedures. The concentration of a saturated brine solution is 358 g of NaCl in 1.00 kg of water giving a...
You have a separatory funnel that contains a solution of 4-methyl benzoic acid and ethoxybenzene in methylene chloride. By adding KOH (aq) into this solution for extraction, what compound(s) would be expected to form in the aqueous layer? Write the equation. Compound X has a hexane/water distribution coefficient of 2.0. (a) Does compound X have a higher or lower solubility in hexane comparing to water? (b) How much of a 3.0 g sample of compound X dissolved in 100 ml...
Acid/Base Extraction
1. Provide a flow chart detailing the acid/base
extraction/separation of the compounds shown below. Your answer
must employ the following reagents: methylene chloride,
hydrochloric acid (1M & 6M), sodium hydroxide (1M & 6M),
10% sodium bicarbonate (aq). Clearly indicate the product(s) and
layers formed following each step of your separation scheme.
IMPORTANT: p-cresol is soluble in sodium hydroxide solution but
insoluble in neutral water or sodium bicarbonate solution. 2-
ethylbenzoic acid is soluble in both sodium hydroxide and...
Provide a flow chart detailing the acid/base extraction/separation of the compounds show below. Your answer must employ the following reagents: methylene chloride, hydrochloric acid (1M & 6M), sodium hydroxide (1M & 6M), 10% sodium bicarbonate (aq). Clearly indicate the product(s) and layers formed following each step of your separation scheme. IMPORTANT: p-cresol is soluble in sodium hydroxide solution but insoluble in neutral water or sodium bicarbonate solution. 2-ethylbenzoic acid is soluble in both sodium hydroxide and sodium bicarbonate solutions. Use...
Using your notetbook (which should have any equaitons/tables/ vital information) answer the questions below. Showing ALL math when needed. (20 pts) 1. The pain reliever phenacetin is soluble in cold water to an extent of 1.0 g/1310 ml and soluble in diethyl ether to an exient of 1.0 g/90ml. Determine the approximate distribution coefficient for phenacetin in those two solvents. (6 pts) 2. Why must the stopper be removed from the separatory funnel before the lower layer is removed? (4...
Part A 1. If you had used more methylene chloride in each step, you could have extracted more caffeine. Explain why you did not. Hint - What step would have taken longer (Hint: not drying). PART A Mass of Beaker & Caffeine Mass of Beaker 167.750g 67.6809 Mass of Caffeine 0.0 75 Calculations. Show your work and circle the answers. Mass of caffeine recovered: 012919 b) Actual:.07 % caffeine recovered: a) Predicted: 9 7:213% b) Actual: 92.105% PART B Unknown...
1) Explain how saturated NaCl solution would help draw the water away from the organic layer in the emulsion layer. 2) You have a solution of 30 mg of caffeine dissolved in 100 mL of water. The partition coefficient for aqueous caffeine extracted with Dichloromethane (CH2C12) is 4.6. Show all work for the following calculations: a. Calculate the total mg extracted by using a single 30 mL portion of dichloromethane. b. Calculate the total mg extracted by using a three...
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