A simple distillation was performed to separate a mixture containing both hexane and heptane. Explain why...
A simple distillation was performed to separate a mixture containing both hexane and heptane. Explain why the observed starting vapor temperature in the simple distillation should be above the boiling point of hexane. Then, explain why if a fractional distillation was performed instead you would have a better separation (be sure to include how the fractionating column works in your explanation).
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A simple distillation was performed to separate a mixture
containing both hexane and heptane. Explain why...
Which technique (simple, fractional, or steam distillation) should be used to separate a hexane-water mixture.
Which technique (simple, fractional, or steam distillation) should be used to separate a hexane-water mixture.
3. A mixture of two miscible liquids with widely different boiling points is distilled. The temperature of the vapo...
3. A mixture of two miscible liquids with widely different boiling points is distilled. The temperature of the vapor is observed to plateau and then drop before rising again. Explain this temperature drop. (3 points) 4. If you doubled the length of the fractional distillation column, what would be the advantages and disadvantages? (3 points) 5. Why is better separation of two liquids achieved by slower heating of a mixture? (3 points)
Questions about distillation: Titration Data - Fractional Distillation -Simple Distillation - Temperature (Celsius) -- -- ---...
Questions about distillation:
Titration Data - Fractional Distillation -Simple Distillation - Temperature (Celsius) -- -- --- --- --- --- -- --- -- --- B.P. methanol = 65C B.P. ethanol = 78C 0 0 0 0 0 0 0 0 0 15 Volume (ml) 1. Why does the fractional distillation show no change in temperature while the system is heated and approximately 20mL is distilled? What is occurring when the temperature increases rapidly at about 25ml? 2. At 70°C, the vapour...
QUESTIONS ON DISTILLATION TO BE TURNED IN Name - You were to separate a mixture containing...
QUESTIONS ON DISTILLATION TO BE TURNED IN Name - You were to separate a mixture containing 20 ml of hexane and 20 ml of sodium acetate. At 60°C, the total pressure of the system is 720 torr. 1. What is the mole fraction of each component? 2. Calculate the partial pressures of the components. 3. What is the vapor pressure lowering of hexane? What other two properties, entities, or functions have similar properties as vapor pressure lowering? What happens as...
A simple distillation is performed to separate liquids X and Y. Liquid X has a vapor...
A simple distillation is performed to separate liquids X and Y. Liquid X has a vapor pressure of 180 Torr at room temperature while liquid Y has a vapor pressure of 55 Torr. Which statement best describes the collected distillate? Note: the distillate is defined as the solution that is collected from the distillation process. It will be equal quantities of X and Y It will be enriched in X relative to the initial mixture It will be 100% pure...
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...
A student performed a simple distillation in an attempt to separate the two components of a...
A student performed a simple distillation in an attempt to
separate the two components of a 50/50 solution of hexane and
toluene. While doing so, the student recorded the temperature of
the vapors as the distillation proceeded. The data is included
below. Using the provided data, make a graph of temperature of the
vapors versus the volume of distillate collected.
Distillation data Volume (mL) Temp (deg C) 0.05 74 74 2 75 3 76 4 78 5 79 6 80...
Explain why the boiling point of a two-component mixture rises slowly throughout a simple distillation when...
Explain why the boiling point of a two-component mixture rises slowly throughout a simple distillation when the boiling-point differences or not large
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...
Explain what effect each of the following mistakes would have on a simple distillation: a) Failure to add a boilin...
Explain what effect each of the following mistakes would have on a simple distillation: a) Failure to add a boiling stone. b) Heating the distillation flask too fast. c) Heating the distillation flask to dryness. d)Using a distillation flask that has a maximum capacity equal to the volume of liquid. e) Using a much larger (e.g., 50 mL) distillation flask. f)Putting the thermometer all the way into the liquid in the distillation flask 1. 2. Using Raoult's Law, calculate the...
3. A mixture of two miscible liquids with widely different boiling points is distilled. The temperature of the vapor is observed to plateau and then drop before rising again. Explain this temperature drop. (3 points) 4. If you doubled the length of the fractional distillation column, what would be the advantages and disadvantages? (3 points) 5. Why is better separation of two liquids achieved by slower heating of a mixture? (3 points)
Questions about distillation:
Titration Data - Fractional Distillation -Simple Distillation - Temperature (Celsius) -- -- --- --- --- --- -- --- -- --- B.P. methanol = 65C B.P. ethanol = 78C 0 0 0 0 0 0 0 0 0 15 Volume (ml) 1. Why does the fractional distillation show no change in temperature while the system is heated and approximately 20mL is distilled? What is occurring when the temperature increases rapidly at about 25ml? 2. At 70°C, the vapour...
QUESTIONS ON DISTILLATION TO BE TURNED IN Name - You were to separate a mixture containing 20 ml of hexane and 20 ml of sodium acetate. At 60°C, the total pressure of the system is 720 torr. 1. What is the mole fraction of each component? 2. Calculate the partial pressures of the components. 3. What is the vapor pressure lowering of hexane? What other two properties, entities, or functions have similar properties as vapor pressure lowering? What happens as...
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...
A student performed a simple distillation in an attempt to
separate the two components of a 50/50 solution of hexane and
toluene. While doing so, the student recorded the temperature of
the vapors as the distillation proceeded. The data is included
below. Using the provided data, make a graph of temperature of the
vapors versus the volume of distillate collected.
Distillation data Volume (mL) Temp (deg C) 0.05 74 74 2 75 3 76 4 78 5 79 6 80...
Explain what effect each of the following mistakes would have on a simple distillation: a) Failure to add a boiling stone. b) Heating the distillation flask too fast. c) Heating the distillation flask to dryness. d)Using a distillation flask that has a maximum capacity equal to the volume of liquid. e) Using a much larger (e.g., 50 mL) distillation flask. f)Putting the thermometer all the way into the liquid in the distillation flask 1. 2. Using Raoult's Law, calculate the...
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