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2. Which method is better for purifying a mixture of two liquids that boil at nearly...
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...
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)
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).
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...
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...
Which property or properties would be the most useful in characterizing an organic compound that a...
Which property or properties would be the most useful in characterizing an organic compound that a solid at room temperature. melting point 1L refractive index IL boiling pointIV. color is a solid at room a. b. II and IV f. II and II1 js a lvguid a rooeriy or propertis would be the most usctaul in characteriving an organic compound that I. melting point I. refractive index III. boiling pointIV. color a. b. III and IV c.? f. II and...
2. Aliquid mixture contains two substances whose boiling points are only 10°C apart. Which method of...
2. Aliquid mixture contains two substances whose boiling points are only 10°C apart. Which method of distillation should be utilized to obtain a clean separation of the two substances. Explain. 3. Which of the following pairs of liquids could be separated by simple distillation? Why? a. Ethyl acetate (b.p. 77°C) & Phenol (b.p. 181.7°C) b. Cyclohexane (b.p. 80.7°C) & Toluene (b.p. 111C) C. Hexane (b.p. 69.10C) & Ethylbenzene (b.p. 136°C) 4. What effect would (a) an increase or (b) a...
a. Is distillation a purification or a characterization technique? Explain. b. Where the thermometer bulb should...
a. Is distillation a purification or a characterization technique? Explain. b. Where the thermometer bulb should be placed in order to measure the temperature of the hot vapor accurately during distillation? c. What is the purpose of the “packing” in a fractional distillation column? d. Why should a distillation flask never be more than ¾ full before starting a distillation? e. You are fractionally distilling 100 mL of a 1:1 solution of cyclohexane and toluene. After 2 mL has distilled...
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...
5. a) How many vaporization-condensation events are there in each? (4pt) Choices: zero ; one ;...
5. a) How many vaporization-condensation events are there in each? (4pt) Choices: zero ; one ; more than one i) a simple distillation ii) a fractional distillation b) In theory, which method above should give a better separation of two liquids with bp <100°C difference? 6. State what is wrong with the setup in each of the following pictures? (6pt) Water out Water in Water out Water in Substance to be distilled
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...
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...
Which property or properties would be the most useful in characterizing an organic compound that a solid at room temperature. melting point 1L refractive index IL boiling pointIV. color is a solid at room a. b. II and IV f. II and II1 js a lvguid a rooeriy or propertis would be the most usctaul in characteriving an organic compound that I. melting point I. refractive index III. boiling pointIV. color a. b. III and IV c.? f. II and...
2. Aliquid mixture contains two substances whose boiling points are only 10°C apart. Which method of distillation should be utilized to obtain a clean separation of the two substances. Explain. 3. Which of the following pairs of liquids could be separated by simple distillation? Why? a. Ethyl acetate (b.p. 77°C) & Phenol (b.p. 181.7°C) b. Cyclohexane (b.p. 80.7°C) & Toluene (b.p. 111C) C. Hexane (b.p. 69.10C) & Ethylbenzene (b.p. 136°C) 4. What effect would (a) an increase or (b) a...
5. a) How many vaporization-condensation events are there in each? (4pt) Choices: zero ; one ; more than one i) a simple distillation ii) a fractional distillation b) In theory, which method above should give a better separation of two liquids with bp <100°C difference? 6. State what is wrong with the setup in each of the following pictures? (6pt) Water out Water in Water out Water in Substance to be distilled
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