In this experiment, 0.070 g of caffeine is dissolved in 4.0 ml of water. The caffeine...
Homework Answers
The structures of the 3 compounds are shown below:
Caffeine and methylene chloride are both polar organic compounds, with dipole-dipole and dispersion forces as their intermolecular bonds.
Water is a polar inorganic compound with strong intermolecular hydrogen bonding, and also dipole-dipole and dispersion forces.
The caffeine will thus prefer the solvent with the most similar intermolecular bonding, i.e. methylene chloride.
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In this experiment, 0.070 g of caffeine is dissolved in 4.0 ml of water. The caffeine...
0.070 g of caffeine is dissolved in 4.0 mL of water. The caffeine is extracted from...
0.070 g of caffeine is dissolved in 4.0 mL of water. The caffeine is extracted from the aqueous solution three times in 2.0 mL portions of methylene chloride. Calculate the total amount of caffeine that can be extracted into the three portions of methylene chloride. Caffeine has a distribution coefficient of 4.6, between methylene chloride and water.
In this experiment, 0.170 g of caffeine is dissolved in 10.0 mL of water. The caffeine...
In this experiment, 0.170 g of caffeine is dissolved in 10.0 mL of water. The caffeine is extracted from the aqueous solution three times with 5.0-mL portions of methylene chloride. Calculate the total amount of caffeine that can be extracted into the three portions of methylene chloride (see Technique 12, Section 12.2). Caffeine has a distribution coefficient of 4.6 between methylene chloride and water.In this experiment, 0.170 g of caffeine is dissolved in 10.0 mL of water. The caffeine is...
I need help ? 3. In an experiment, 0.075 g of a compound is dissolved in...
I need help ?
3. In an experiment, 0.075 g of a compound is dissolved in 4.0 mL of water. This compound is extracted from the aqueous solution two times with 2.0 mL portions of methylene chloride. Calculate the total amount of the compound that will be extracted into methylene chloride. This compound has a distribution coefficient of 4.6 between methylene chloride and water. 4. Look up the solubilities of chlorobenzene and p-dichlorobenzene in water. Which one do you expect...
5. Consider a 0.015 L aqueous solution that contains 1.4 g of caffeine. The solubility of...
5. Consider a 0.015 L aqueous solution that contains 1.4 g of caffeine. The solubility of caffeine in water is 2.2 g/100 mL and the solubility in methylene chloride is 10.2 g/100 mL a) How much caffeine can be extracted with 15 mL of methylene chloride? b) How much caffeine will be extracted if the aqueous solution is extracted twice with 7.5 mL of methylene chloride? o) Which is more efective a or b? 2017 Wal-Mart Stores, Inc Neon Pink...
5 gram of 3-chlorobenzoic acid, 8 grams of 2-heptylamine and 6 grams of anthracene are dissolved...
5 gram of 3-chlorobenzoic acid, 8 grams of 2-heptylamine and 6 grams of anthracene are dissolved in 25 mL of dichloromethane. This mixture is placed in a separatory funnel and extracted three times with a 3 M HCl solution. Combined aqueous extracts are back extracted with 10 mL of dichloromethane. The combined organic layers are then extracted three times with a 3 M NaOH solution. Combined aqueous extracts are back extracted with 10 mL of dichloromethane. All of the organic...
1.) What percent recovery could be expected if 1.000 g of caffeine was initially dissolved in...
1.) What percent recovery could be expected if 1.000 g of
caffeine was initially dissolved in 120 mL of water and then
extracted with a single 80 mL portion of ethyl acetate?
2.) What percent recovery could be expected if 1.000 g of
caffeine was initially dissolved in 120 mL of water and then
extracted as per the protocol given in the lab manual?
3.) Percent recovery and percent yield are occasionally used as
if they are interchangeable terms. They...
If each bag of Lipton black tea contains 55 mg of caffeine, what is the maximum...
If each bag of Lipton black tea contains 55 mg of caffeine, what is the maximum amount of caffeine that you could extract from one using our procedure? Assume one bag and 40mL of tea-water at the end of initial solid-liquid extraction. The partition coefficient (K) for caffeine in methylene chloride is 7.2. How much caffeine could be extracted using our procedure if we had used ethyl acetate (K = 2.0) instead of methylene chloride? Explain why the amount does...
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...
3. (hard) 85.0 g NaCl was dissolved in 1.50 L water. 765 mL of this solution...
3. (hard) 85.0 g NaCl was dissolved in 1.50 L water. 765 mL of this solution was heated on a hotplate 488 mL of water was evaporated off. What is the resulting concentration of the sodium chloride die beleid en die gelution? and then 7b] = D.7652 488 m > 1,438L
An aqueous solution containing 5.00 g of solute X in 100. mL is extracted five times...
An aqueous solution containing 5.00 g of solute X in 100. mL is extracted five times with 25.0 mL portions of organic solvent A each. What is the total amount of solute X that will be extracted by the solvent A. Given Ksolvent A/water = 3.75
I need help ?
3. In an experiment, 0.075 g of a compound is dissolved in 4.0 mL of water. This compound is extracted from the aqueous solution two times with 2.0 mL portions of methylene chloride. Calculate the total amount of the compound that will be extracted into methylene chloride. This compound has a distribution coefficient of 4.6 between methylene chloride and water. 4. Look up the solubilities of chlorobenzene and p-dichlorobenzene in water. Which one do you expect...
5. Consider a 0.015 L aqueous solution that contains 1.4 g of caffeine. The solubility of caffeine in water is 2.2 g/100 mL and the solubility in methylene chloride is 10.2 g/100 mL a) How much caffeine can be extracted with 15 mL of methylene chloride? b) How much caffeine will be extracted if the aqueous solution is extracted twice with 7.5 mL of methylene chloride? o) Which is more efective a or b? 2017 Wal-Mart Stores, Inc Neon Pink...
1.) What percent recovery could be expected if 1.000 g of
caffeine was initially dissolved in 120 mL of water and then
extracted with a single 80 mL portion of ethyl acetate?
2.) What percent recovery could be expected if 1.000 g of
caffeine was initially dissolved in 120 mL of water and then
extracted as per the protocol given in the lab manual?
3.) Percent recovery and percent yield are occasionally used as
if they are interchangeable terms. They...
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...
3. (hard) 85.0 g NaCl was dissolved in 1.50 L water. 765 mL of this solution was heated on a hotplate 488 mL of water was evaporated off. What is the resulting concentration of the sodium chloride die beleid en die gelution? and then 7b] = D.7652 488 m > 1,438L
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