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distillation techniques that can be used to purify a compound 2. (2 pts) Name two known...
1. A student carried out a simple distillation on a compound known to boil at 124°C...
1. A student carried out a simple distillation on a compound known to boil at 124°C and reported an observed boiling point of 116°-117°C. TLC comparison of the product showed that the compound was pure, and a calibration of the thermometer indicated that it was accurate. What procedural error might the student have made in setting up the distillation apparatus? 2. Which method is better for purifying a mixture of two liquids that boil at nearly the same temperature: simple...
Distillation 11 4. The organic liaud in Sicam distillatior vaporites at: a) Lower temperature than its...
Distillation 11 4. The organic liaud in Sicam distillatior vaporites at: a) Lower temperature than its boiling point b) Higher temperature than its boiling point c) At its boiling point d) None of the mentioned 2. In steam distillation, the liquid boils when th allation, the liquid boils when the sum of the organic liquid vapor pressure and the water vapor pressure is: a) Greater than atmospheric pressure b) Lesser than atmospheric pressure Equals to atmospheric pressure d) None of...
Question 6 (10 pts) Steam distillation can be run more efficiently in some cases using super-heated...
Question 6 (10 pts) Steam distillation can be run more efficiently in some cases using super-heated steam at 1 atm pressure rather than boiling water. By increasing the temperature of the steam beyond the boiling point of water in a controlled fashion, the oil may still be protected from degradation while increasing its contribution to the vapor composition, making the process more efficient. At 150 °C, linalyl acetate exerts a vapor pressure of 93 torr. If a steam still were...
The distillation column shown at the right is used to separate compound A from compound B...
The distillation column shown at the right is used to separate compound A from compound B in an adiabatic fashion. A liquid mixture of A and B is fed at a specified temperature into a distillation column (stream 1). At the top of the column, a vapor stream that is A-rich (stream 2) passes through a condenser that completely condenses the mixture. Half of this liquid leaves the condenser as the overhead product (stream 4), and half of the liquid...
+ AWN t Vacuum Distillation Question 2 °C 400- 700 600 ***** 300- 500 ल 400...
+ AWN t Vacuum Distillation Question 2 °C 400- 700 600 ***** 300- 500 ल 400 200- 300 200 100- 100- Pressure in torr B.P. corrected to 760 torr Observed B.P. A vacuum distillation is being carried out on a mixture of two miscible liquids. Under the reduced pressure used in the separation, liquid A boils at 100°C. If liquid A has a normal boiling point of 200 degrees centigrade and liquid B has a normal boiling point of 300°C,...
1. Explain how a fractionating column increases the separation of two liquids. 2. What is an...
1. Explain how a fractionating column increases the separation of two liquids. 2. What is an azeotrope? Do you think the mixture used in the lab is an example of an azeotrope? Explain. 3. Explain how the boiling point of a liquid is affected by the addition of a non-volatile solute (hint: it is a colligative property). Is the temperature above such solution lower, higher or the same as the pure liquid? Explain why. 4. You were asked to record...
9. A mixture (solution) of 3 different liquid compounds is formed. Each compound has the same...
9. A mixture (solution) of 3 different liquid compounds is formed. Each compound has the same condensed formula of C4H10O. Separate analyses of these compounds confirmed that none of the compounds has branching of C’s from the main chain of attached C atoms. Also one of the compounds experiences a weaker interparticle force as its dominant force than the other two. (a) Draw 3 possible preferred Lewis structures consistent with the above formula and information. It is desired to separate...
Name: Consider the following compound: a. (4 pts) Write its systematic name: b. (2 pts) How...
Name: Consider the following compound: a. (4 pts) Write its systematic name: b. (2 pts) How many equivalents of a Grignard reagent would react with it 2. (3 pts) Consider the following compound: a. (3 pts) In the space above, write the names of all the carbonyl-containing functional groups in it. b. (2 pts) On the structure, circle the two carbonyls that are the most electrophilic (no need to decide which is most vs second-most). Consider the following reaction, whose...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
35. In a distillation set up a) Cold water flows into the condenser from the elevated...
35. In a distillation set up a) Cold water flows into the condenser from the elevated end of the condenser and flows out of the lower end b) Plastic joint clips should not be used to hold the glass joints of the equipment together, equipment clamps are sufficient c) In a properly set up distillation experiment azeotropes will never occur. d) A and C alone e) None of the above 34. If a distillation is carried out under reduced pressure...
1. A student carried out a simple distillation on a compound known to boil at 124°C and reported an observed boiling point of 116°-117°C. TLC comparison of the product showed that the compound was pure, and a calibration of the thermometer indicated that it was accurate. What procedural error might the student have made in setting up the distillation apparatus? 2. Which method is better for purifying a mixture of two liquids that boil at nearly the same temperature: simple...
Distillation 11 4. The organic liaud in Sicam distillatior vaporites at: a) Lower temperature than its boiling point b) Higher temperature than its boiling point c) At its boiling point d) None of the mentioned 2. In steam distillation, the liquid boils when th allation, the liquid boils when the sum of the organic liquid vapor pressure and the water vapor pressure is: a) Greater than atmospheric pressure b) Lesser than atmospheric pressure Equals to atmospheric pressure d) None of...
Question 6 (10 pts) Steam distillation can be run more efficiently in some cases using super-heated steam at 1 atm pressure rather than boiling water. By increasing the temperature of the steam beyond the boiling point of water in a controlled fashion, the oil may still be protected from degradation while increasing its contribution to the vapor composition, making the process more efficient. At 150 °C, linalyl acetate exerts a vapor pressure of 93 torr. If a steam still were...
The distillation column shown at the right is used to separate compound A from compound B in an adiabatic fashion. A liquid mixture of A and B is fed at a specified temperature into a distillation column (stream 1). At the top of the column, a vapor stream that is A-rich (stream 2) passes through a condenser that completely condenses the mixture. Half of this liquid leaves the condenser as the overhead product (stream 4), and half of the liquid...
+ AWN t Vacuum Distillation Question 2 °C 400- 700 600 ***** 300- 500 ल 400 200- 300 200 100- 100- Pressure in torr B.P. corrected to 760 torr Observed B.P. A vacuum distillation is being carried out on a mixture of two miscible liquids. Under the reduced pressure used in the separation, liquid A boils at 100°C. If liquid A has a normal boiling point of 200 degrees centigrade and liquid B has a normal boiling point of 300°C,...
Name: Consider the following compound: a. (4 pts) Write its systematic name: b. (2 pts) How many equivalents of a Grignard reagent would react with it 2. (3 pts) Consider the following compound: a. (3 pts) In the space above, write the names of all the carbonyl-containing functional groups in it. b. (2 pts) On the structure, circle the two carbonyls that are the most electrophilic (no need to decide which is most vs second-most). Consider the following reaction, whose...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
35. In a distillation set up a) Cold water flows into the condenser from the elevated end of the condenser and flows out of the lower end b) Plastic joint clips should not be used to hold the glass joints of the equipment together, equipment clamps are sufficient c) In a properly set up distillation experiment azeotropes will never occur. d) A and C alone e) None of the above 34. If a distillation is carried out under reduced pressure...
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