The following data was collected for this experiment: A sample of 0.8281 g of phenylsuccinic acid was dissolved in 10 mL of acetone. This sample gave a reading, aobs, of +10.278 deg on the polarimeter. A tube measuring 1 dm was used for the sample. What is the major enantiomer present in this sample? Calculate the concentration of the sample used in g/mL. Calculate the observed specific rotation [a]obs of the sample. Give your answer to 4 significant figures.

The following data was collected for this experiment: A sample of 0.8281 g of phenylsuccinic acid was dissolved in 10 mL of acetone. This sample gave a reading, aobs, of +10.278 deg on the polarimeter. A tube measuring 1 dm was used for the sample. What is the major enantiomer present in this sample? Calculate the concentration of the sample used in g/mL. Calculate the observed specific rotation [a]obs of the sample. Give your answer to 4 significant figures.

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter20: Dienes, Conjugated Systems, And Pericyclic Reactions

Section: Chapter Questions

Problem 20.25P

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The following data was collected for this experiment: A sample of 0.8281 g of phenylsuccinic acid was dissolved in 10 mL of acetone. This sample gave a reading, aobs, of +10.278 deg on the polarimeter. A tube measuring 1 dm was used for the sample. Calculate the enantiomeric excess (EE) of the sample. The literature-specific rotation, [a]lit, of phenylsuccinic acid in acetone is 173 deg. Give your answer to 3 significant figures. Calculate the percent (%) of (+)-phenylsuccinic acid that is in this sample. Give your answer to 3 significant figures. Calculate the percent (%) of (-)-phenylsuccinic acid that is in this sample. Give your answer to 3 significant figures.
Viktor measures out 2.100 g of the ibuprofen from the bottle and dissolves it in 15.0 mL of ethanol. He transfers this solution to a 1.0 dm long tube and the polarimeter gives him a reading of +7.3416 deg for this sample. The literature specific rotation for ibuprofen is 57 deg. What is the observed specific rotation for this sample? What is the enantiomeric excess (EE) for this sample?
Calculate the specific rotations of the following samples taken at 25 °C using the sodium D line.1.00 g of sample is dissolved in 20.0 mL of ethanol. Then 5.00 mL of this solution is placed in a 20.0-cm polarimeter tube. The observed rotation is 1.25° counterclockwise.
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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?