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The specific rotation of pure (-)-2-butanol is -13.5°. If a mixture has a specific rotation of...
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?
2. The optical activity, measured by specific rotation, of pure (R-malic acid is [a]20D-+27% What is the specific rotation of a mixture of 50% and 50% of (R)-malic acid and (S)-malic acid? What is enantiomeric excess of a sample of malic acid containing both enantiomers that has a [al20D -0% [a]20D-27"; [a]20D-_ 13.5": [a]20D-+ 13.5°
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...
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...
Assume that optically pure (S)-2-iodononane has a specific rotation of + 9.5o (clockwise rotation of the plane-polarized light). Claculate the percentage of (S) enantiomer required when the specific rotation for a mixture of 2-iodononane enantiomers will be -2.1o (counterclockwise rotation of the plane-polarized light).
The specific rotation [a] of pure quinine is -165º. A solution containing both quinine and its enantiomer has a specific rotation of -63º. Calculate the percentage of quinine present in the mixture? (show calculations; 0.3 pts) HO LN HC quinine % quinine =
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...
1) Suppose that a pure compound has a specific rotation of +49°. In the laboratory a solution in which the compound is mixed with its enantiomer is found to have a specific rotation of +12. What is the %ee of the mixture? What percent of the mixture is (+) enantiomer and what percent is (-) enantiomer? 2) Give the structure of 3,3-Dimethylpetane. How many monochlorinated product can be formed from this compound reacting with Cl? Give the structure of each...
If a pure R isomer has a specific rotation of – 106.0°, and a sample contains 79.0% of the R isomer and 21.0% of its enantiomer, what is the observed specific rotation of the mixture? Number [a] = 10
If a pure R isomer has a specific rotation of –136.0°, and a sample contains 65.0% of the R isomer and 35.0% of its enantiomer, what is the observed specific rotation of the mixture?