a)The optical rotation of a sample of 2-butanol is measured to be αobs = -0.35º. The...
a)The optical rotation of a sample of 2-butanol is measured to be αobs = -0.35º. The specific rotation for pure (+)-2-butanol is [α]D = 13.52° ml/g dm. If the cell path length was 0.6 dm and the concentration of 2-butanol in the sample was 0.15 g/ml, calculate the specific rotation and the percentage of the (+) and (-) isomers in your sample.
b)You have a sample that you know is composed of 21% R isomer and 79% S isomer. What is the % optical purity of the sample? If you know that the specific rotation for the pure S isomer is [α] = +75°, what would you expect the observed specific rotation for your sample to be?
Homework Answers
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a)The optical rotation of a sample of 2-butanol is measured to
be αobs = -0.35º. The...
5.42 The specific rotation of (S)-2-butanol is +13.5. If 1.00 g of its enantiomer is dissolved...
5.42 The specific rotation of (S)-2-butanol is +13.5. If 1.00 g of its enantiomer is dissolved in 10.0 mL of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect?
Prelab Questions: 1. Calculate the observed specific rotation for the following molecule given the following informatio...
Prelab Questions: 1. Calculate the observed specific rotation for the following molecule given the following information: Observed rotation = +15.6 Path length = 1 dm Concentration = 0.5 g/mL (These calculation were performed at 25 °C using a Sodium “D” lamp) 2. A sample of chiral 2-butanol has a specific rotation of -3.25º. Determine the % ee and the molecular composition of this sample (% of one enantiomer and % of opposite enantiomer). The specific rotation of pure (-)-2-butanol is...
What observed rotation is expected when a 1.72 M solution of (R)-2-butanol is mixed with an...
What observed rotation is expected when a 1.72 M solution of (R)-2-butanol is mixed with an equal volume of a 0.860 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long? The specific rotation of (R)-2-butanol is - 13.9 degrees mL g 'dm"? Number deg
What observed rotation is expected when a 1.00 M solution of (R)-2-butanol is mixed with an...
What observed rotation is expected when a 1.00 M solution of (R)-2-butanol is mixed with an equal volume of a 0.500 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long? The specific rotation of (R)-2-butanol is –13.9 degrees mL g–1 dm–1.
What observed rotation is expected when a 1.36 M solution of (R)-2-butanol is mixed with an...
What observed rotation is expected when a 1.36 M solution of (R)-2-butanol is mixed with an equal volume of a 0.680 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long? The specific rotation of (R)-2-butanol is –13.9 degrees mL g–1 dm–1. please show all work
- +13.52, and (R)-(-)-2-butanol, (a)" --13.52, with a measured specific rotation (a) = +6.76? What is...
- +13.52, and (R)-(-)-2-butanol, (a)" --13.52, with a measured specific rotation (a) = +6.76? What is the percent composition of a mixture of (S)-+)-2-butanol. [a] 67% (R), 339 (5) . 75%(R. 25 (5) 50% (R), 5006 (5) 3345R1.67% (5) e 25% (R), 754 (5)
5.41 Predict the value for the specific rotation of the following compound. Explain your answer. -OH...
5.41 Predict the value for the specific rotation of the following compound. Explain your answer. -OH НО. 5.42 The specific rotation of (S)-2-butanol is +13.5. If 1.00 g of its enantiomer is dissolved in 10.0 mL of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect? 5.43 The specific rotation of l-alanine in water (at 25°C) is +2.8. A chemist prepared a mixture of l- alanine and its enantiomer, and...
3. Pure Θ Kaylanoic acid has a specific rotation of-160° (same conditions and temperature as sample...
3. Pure Θ Kaylanoic acid has a specific rotation of-160° (same conditions and temperature as sample above). What is the % optical purity of the sample above ? (0.75 points) 4. 3.5 mg of optically-enriched(-) antibiotic Zachromycin was dissolved in 1.00 mL methanol in a 1.00 mL volumetric flask. The optical rotation was found to be -0.02220 in a 5.0 cm cell. What is the specific rotation? (0.75 points) 5. Calculate the enantiomeric excess and the specific rotation of a...
A sample of 2-butanol containing 0.375 g in 12.5 mL of solvent was analyzed in a...
A sample of 2-butanol containing 0.375 g in 12.5 mL of solvent was analyzed in a polarimeter using a 10.0 cm polarimeter tube. The sample had an optical rotation , a, of -0.405. )A) What is the specific rotation of 2-butanol? (B) A sample of enantiomer of the compound in A had optical rotation of +0.670 in a 10.0 cm polarimeter tube. What is the concentration of the second sample?
1a. A sample of 2-butanol has a specific rotation of +3.25°. Determine the % ee and...
1a. A sample of 2-butanol has a specific rotation of +3.25°. Determine the % ee and the molecular composition of this sample. The specific rotation of pure (+)-2-butanol is +13.0. 1b. A sample of 2-butanol has a specific rotation of –9.75°. Determine the % ee and the molecular composition of this sample.
5.42 The specific rotation of (S)-2-butanol is +13.5. If 1.00 g of its enantiomer is dissolved in 10.0 mL of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect?
Prelab Questions: 1. Calculate the observed specific rotation for the following molecule given the following information: Observed rotation = +15.6 Path length = 1 dm Concentration = 0.5 g/mL (These calculation were performed at 25 °C using a Sodium “D” lamp) 2. A sample of chiral 2-butanol has a specific rotation of -3.25º. Determine the % ee and the molecular composition of this sample (% of one enantiomer and % of opposite enantiomer). The specific rotation of pure (-)-2-butanol is...
What observed rotation is expected when a 1.72 M solution of (R)-2-butanol is mixed with an equal volume of a 0.860 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long? The specific rotation of (R)-2-butanol is - 13.9 degrees mL g 'dm"? Number deg
- +13.52, and (R)-(-)-2-butanol, (a)" --13.52, with a measured specific rotation (a) = +6.76? What is the percent composition of a mixture of (S)-+)-2-butanol. [a] 67% (R), 339 (5) . 75%(R. 25 (5) 50% (R), 5006 (5) 3345R1.67% (5) e 25% (R), 754 (5)
5.41 Predict the value for the specific rotation of the following compound. Explain your answer. -OH НО. 5.42 The specific rotation of (S)-2-butanol is +13.5. If 1.00 g of its enantiomer is dissolved in 10.0 mL of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect? 5.43 The specific rotation of l-alanine in water (at 25°C) is +2.8. A chemist prepared a mixture of l- alanine and its enantiomer, and...
3. Pure Θ Kaylanoic acid has a specific rotation of-160° (same conditions and temperature as sample above). What is the % optical purity of the sample above ? (0.75 points) 4. 3.5 mg of optically-enriched(-) antibiotic Zachromycin was dissolved in 1.00 mL methanol in a 1.00 mL volumetric flask. The optical rotation was found to be -0.02220 in a 5.0 cm cell. What is the specific rotation? (0.75 points) 5. Calculate the enantiomeric excess and the specific rotation of a...
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