An aqueous solution containing 6.67 g of an optically-pure compound was diluted to 7.00 x 10² mL with water and placed in a 15.0 cm long polarimeter tube. The measured rotation was -2.61° at 25° C. Calculate the specific rotation of the compound. - [a] =
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- The specific rotation, [a]p, for (-)-2-butanol is +14. What is the observed rotation for a solution of 2.5 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 -4.6 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?The observed rotation of 2.0 g of a compound in 50 mL of solution in a polarimeter tube 20 cm long is +138°. What is the specific rotation of the compound?the observed rotation, α, of a 59.9 mg mL-1 solution of an optically-active substance in a 20 cm path length polarimeter was +3.7°. Calculate the value of the specific rotation, [α], in degrees to one decimal place.
- 1. 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.The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is +0.75 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?How can we decide whether an observed rotation of a solution of an optically active compound is +170° and not actually -190°?
- 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.2. 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?The specific rotation, [x]p, for sucrose is +67. What is the observed rotation for a solution of 1.0 g of sucrose 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?
- 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?7. The following compound (2,3-dihydroxysuccinic acid) with two chiral centers was synthesized in laboratory. Measurement of its optical activity showed zero (0) optical activity. What can be the reason for its optical inactivity? HO,C HO HO, CO,H 2,3-dihydroxysuccinic acidThe specific rotation, [a]p, for (-)-malic acid is -27. What is the observed rotation for a solution of 1.2 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm? | degrees. The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is +0.75 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? 9 more group attempts remaining Submit Answer Retry Entire Group