Interpretation:
The specific rotation of the compound has to be calculated.
Concept introduction:
The pair of Enantiomers has different configurations.
Pair of enantiomers has different optical activity, which means if one will show levorotatory then the other will show dextrorotatory.
The direction and magnitude of rotation of plane-polarized light by an optically compound is measured by using polarimeter.
This rotation of polarized light is specific for a compound at specified temperature and wavelength, so it is called as Specific rotation of that compound.
Specific rotation of compound is calculated by,
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CHEM 262 ORG CHEM EBOOK DIGITAL DELIVERY
- The specific rotation, [a]p, for (-)-2-butanol is +14. What is the observed rotation for a solution of 3.3 g of (-)-2-butanol in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees . The observed rotation of a solution of 0.75 g of a compound in 10 mL of water is -6.9 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?arrow_forwardIf a substance is known to have a specific rotation of +20.0 deg mL/g dm, what is the concentration (in g/mL) of a solution that would give an observed rotation of +10.0 degrees, if the path length of the sample tube was 1.00 dm? Can you do this problem in your head?arrow_forwardplease answerarrow_forward
- How can we decide whether an observed rotation of a solution of an optically active compound is +170° and not actually -190°?arrow_forward2. The observed rotation of a compound, X (14.0g dissolved in water to make 100ml. of solution) in a polarimeter tube of length 30cm is +10.5°. What is the specific rotation of X?arrow_forward1. When 0.247 g of monosodium glutamate (MSG) is dissolved in 10.0 mL of water and placed in a sample cell 10.0 cm in length, the observed rotation at 20°(using the D line of sodium) is +0.632°. Calculate the specific rotation of MSG. 2. When 0.095 g of cholesterol is dissolved in 1.00 mL of ether and placed in a sample cell 10.0 cm in length, the observed rotation at 20°C (using the D line of sodium) is -0.299°.Calculate the specific rotation of cholesterol.3. The specific rotation of L-dopa in water (at 15°C) is -39.5. A chemist prepared a mixture of L-dopa and its enantiomer, and this mixture had a specific rotation of -34. Calculate the % ee of this mixture. 4. The specific rotation of vitamin B7 in water (at 22°C) is +92. A chemist prepared a mixture of vitamin B7 and its enantiomer, and this mixture had a specific rotation of +18. Calculate the % ee of this mixture.arrow_forward
- An aqueous solution containing 10 g of an optically pure compound was diluted to 500 mL with water and was found to have a specific rotation of −121º. If this solution were mixed with 500 mL of a solution containing 3 g of a racemic mixture of the compound, what would the specific rotation of the resulting mixture of the compound? What would be its optical purity?arrow_forwardConsider a solution that contains 84.0% R isomer and 16.0% S isomer. If the observed specific rotation of the mixture is −37.0°, what is the specific rotation of the pure R isomer? [a] = = Oarrow_forwardThe specific rotation for compound D is -8.5° dm 1(g/mL)-1, what is the specific rotation of compound E under the same conditions? [a] = -8.5° dm-1 (g/mL)-1 OH O он О он ОН D E -8.5° dm-1 (g/mL)-1 +8.5° dm-1 (g/mL)-1 0° dm-1 (g/mL)-1 not enough information is provided to determine a valuearrow_forward
- CH, CH, Q3: 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 3.50 g of the mixture was dissolved in 10.0 mL of water. This solution was then placed in a sample cell with a pathlength of 10.0 cm and the observed rotation was +0.78. Calculate the % ee of the mixture.arrow_forwardapp:10Tack.co Type here to se OM C O Quin 23 of 30 A solution of a chiral compound was prepared by dissolving 15.67 g in 16.00 mL of solvent. The solution was placed in a tube that is 1.00 dm long. What is the specific rotation of light if the observed rotation was determined experimentally to be +62.41"? ✓ O 1 4 7 2 5 3 6 9 0 DAộ c * ▪ ✪ с x 100 1508227arrow_forwardThe specific rotation of S-Ibuprofen is +54.5o. Which direction would a mixture containing 80% S-Ibuprofen and 10% R-ibuprofen rotate plane polarized light? To the left or to the right?arrow_forward
- EBK A SMALL SCALE APPROACH TO ORGANIC LChemistryISBN:9781305446021Author:LampmanPublisher:CENGAGE LEARNING - CONSIGNMENTOrganic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning