Homework Answers
1)The salt water works to pull the water from the organic layer to the water layer. This is because the saturated salt solution wants to become more dilute and because salts have a stronger attraction to water than to organic solvents. So draw water from organic layer to the emulsion layer
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1) Explain how saturated NaCl solution would help draw the water away from the organic layer in the emulsion layer....
Begin again by assuming 70. mg of caffeine is dissolved in 4.0 mL of water. This...
Begin again by assuming 70. mg of caffeine is dissolved in 4.0 mL of water. This time, however, the aqueous solution will only be extracted ONCE with 6.0 mL of methylene chloride. Calculate the total milligrams of caffeine that can be extracted from the aqueous layer using this volume of methylene chloride. Caffeine has a distribution coefficient of 4.6 (K), between methylene chloride (CH2Cl2) and water.
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...
Suppose a 35 mg of benzoic acid is dissolved in 7ml of dichloromethane. The resulting organic...
Suppose a 35 mg of benzoic acid is dissolved in 7ml of dichloromethane. The resulting organic solution is then extracted with 12 ml of water. It is determined that the dichloromethane layer now contains 31 mg of benzoic acid. A. What is the partition coefficient (kp) of benzoic acid in dicholomethane/water? Please show work! B. Between dichloromethane and water, in which solvent is the benzoic acid more soluble?
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...
If the partition coefficient of a drug between an organic solvent and water is 5, how...
If the partition coefficient of a drug between an organic solvent and water is 5, how many mg of the drug is extracted from a 120 ml of 2% aqueous solution if it was extracted with 60 ml of the organic let mass of compound insolution = 4mg
An extraction was performed according to the following procedure: 1. Dissolve 561 mg of the unknown...
An extraction was performed according to the following procedure: 1. Dissolve 561 mg of the unknown organic compound in 76 water and put solution into a round bottom flask. 2. Add 25 mL of dichloromethane to the separatory funnel, cap the separatory funnel, shake, vent, and then drain off the dichloromethane into a separate beaker. 3. Repeat this process 2 more times, each time adding the organic layer to the beaker. If the partition coefficient for the organic compound in...
A solution containing 105 mg of compound C in 1.0 mL of water is to be extracted with CH2Cl2. The distribution coefficie...
A solution containing 105 mg of compound C in 1.0 mL of water is
to be extracted with CH2Cl2. The distribution coefficient
of C between CH2Cl2 and water is 1.5. Note that compound C is more
soluble in CH2Cl2.
Part 4: Total amount of compound C removed from the aqueous
solution after three 0.70 mL extractions with CH2Cl2.
In Asolution containing 105 mg of compound C in 1.0 mL of water is to be extracted with CH2C12. The distribution coefficient...
Extraction of solids: Experiment outlined below Draw a “roadmap” of the experiment, containing chemical structures and...
Extraction of solids: Experiment outlined below
Draw a “roadmap” of the experiment, containing chemical
structures and “layers” (organic and aqueous). This should contain
the individual reactions occurring in each step, and show which
layer the various components are present. Make sure you think about
whether the acetaminophen, caffeine and aspirin are neutral,
protonated or deprotonated.
Preliminary separation obtain a sample (1.0g) of the mixture. weigh the sample and record it. this sample should consist of a 2:1:1 mixture (by mass)...
Would the methylene chloride layer be above or below the experiment? Justify your answer. 1. aqueous layer in today...
Would the methylene chloride layer be above or below the experiment? Justify your answer. 1. aqueous layer in today's ium carbonate used in the isolation of caffeine? Be specific as to the 2. Why is potass chemical species the carbonate may act on. Why was sodium sulfate used? 3. 4. After introducing 1.0 g of potassium carbonate into the centri hot water extract, it was capped, shaken, and then cooled to room temperature. Following this, roug minute. Why wasn't the...
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...
An extraction was performed according to the following procedure: 1. Dissolve 561 mg of the unknown organic compound in 76 water and put solution into a round bottom flask. 2. Add 25 mL of dichloromethane to the separatory funnel, cap the separatory funnel, shake, vent, and then drain off the dichloromethane into a separate beaker. 3. Repeat this process 2 more times, each time adding the organic layer to the beaker. If the partition coefficient for the organic compound in...
A solution containing 105 mg of compound C in 1.0 mL of water is
to be extracted with CH2Cl2. The distribution coefficient
of C between CH2Cl2 and water is 1.5. Note that compound C is more
soluble in CH2Cl2.
Part 4: Total amount of compound C removed from the aqueous
solution after three 0.70 mL extractions with CH2Cl2.
In Asolution containing 105 mg of compound C in 1.0 mL of water is to be extracted with CH2C12. The distribution coefficient...
Extraction of solids: Experiment outlined below
Draw a “roadmap” of the experiment, containing chemical
structures and “layers” (organic and aqueous). This should contain
the individual reactions occurring in each step, and show which
layer the various components are present. Make sure you think about
whether the acetaminophen, caffeine and aspirin are neutral,
protonated or deprotonated.
Preliminary separation obtain a sample (1.0g) of the mixture. weigh the sample and record it. this sample should consist of a 2:1:1 mixture (by mass)...
Would the methylene chloride layer be above or below the experiment? Justify your answer. 1. aqueous layer in today's ium carbonate used in the isolation of caffeine? Be specific as to the 2. Why is potass chemical species the carbonate may act on. Why was sodium sulfate used? 3. 4. After introducing 1.0 g of potassium carbonate into the centri hot water extract, it was capped, shaken, and then cooled to room temperature. Following this, roug minute. Why wasn't the...
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