5.49 When 0.075 g of penicillamine is dissolved in 10,0 mL of pyridine and placed e...
4. a) 7.00 mg sample dissolved in 1.00ml solvent and solution was placed in a cell with 2.00 cm pathlength, an observed rotation of +0.08 was found. Calculate [a ]p for sample. b) A sample with a concentration of 0.3 g/mL was placed in a cell with a length of 5 cm. The resulting rotation at the sodium D line was t1.52°. What is the [a]D?
4. 0.050 g of sample is dissolved in 2.0 mL of ethanol, and this solution is placed in a 2.0-cm polarimeter tube. The observed rotation is clockwise 0.043. Calculate the specific rotations taken at 25°C using the sodium D line.
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?
5.41 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...
5.56 The specific rotation of vitamin C (using the D line of sodium, at 20°C) is +24 g the D line of sodium, at 20°C) is +24. Predict what the on would be for a solution containing 0.100 g of vitamin C dissolved in of ethanol and placed in a sample cell with a length of 1.00 dm.
14.A solution of 2.0 g of (+) glyceraldehydes, in a 10 ml of water was placed in a mm cell. Using the sodium D line, a rotation of +1.74 was found at 25C. Determine the specific rotation of(+) glyceraldehydes? (5) 15.(+)-Tartaric acid has a specific rotation of +12.0°. Calculate the specific rotation of a mixture 1 of 68% (+)-tartaric acid and 32% (-)-tartaric acid? (5)
A) If the observed rotation for the product mixture obtained from running the reaction in toluene is 18.7, what is the specific rotation of the S enantiomer? B) Based on your answer in part (a), predict what the observed rotation would be for a solution containing 0.250 g of this S-enantiomer dissolved in 10.0 mL of ethanol and placed in a sample cell with a length of 10.0 cm.
optical activity problems.. please show all steps i dont understand You have a sample (Sample X) which is a mixture of +/- Carvone. The solution was made by dissolving 4.50 g of the sample in enough methanol to bring the volume of solution to 10,0 ml. Some of the solution is placed in a 100 cm polarimeter cell and its optical rotation is measured at 25°C using light of the sodium D line wavelength (589.6 nm). The observed rotation is...
PRINTtR VERSION イBACK NEXT Practice Problem 05.43 Your answer is incorrect. Try again. 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-0.38. Calculate the % ee of the mixture. the tolerance is +/-2% SHOW HINT...
8. Polarimetry data a. A student took 0.375 g of the product, (S)-phenylsuccinic acid, and dissolved it in 9.8 mL of acetone. This solution was placed in the observation tube and then the observed rotation was determined. The observed rotation, lobs, was 5.433 i. Given the observed rotation and the pathlength of the polarimeter cell (1 dm), calculate the specific rotation, (a). (1 point) ii. With your answer from 8i, calculate the enantiomeric excess, %ee. Optically pure (5)-(+)-phenylsuccinic acid is...