Dr. VMV weighed out 1.02 g of menthol and dissolved it into 10.0 mL of absolute ethanol in a 10.0 mL volumetric flask. The optical rotation for this solution was obtained in a cell with a 50 mm optical path length, found to be -2.508°, using the Na D-line at 25.1 °C. What is the specific rotation?

Dr. VMV weighed out 1.02 g of menthol and dissolved it into 10.0 mL of absolute ethanol in a 10.0 mL volumetric flask. The optical rotation for this solution was obtained in a cell with a 50 mm optical path length, found to be -2.508°, using the Na D-line at 25.1 °C. What is the specific rotation?

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter92: Polarimetry

Section: Chapter Questions

Problem 2P

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1. Dr. VMV weighed out 1.02 g of menthol and dissolved it into 10.0 mL of absolute ethanol in a 10.0 mL volumetric flask. The optical rotation for this solution was obtained in a cell with a 50 mm optical path length, found to be -2.508°, using the Na D-line at 25.1 °C. What is the specific rotation? 2.0.5 g of optically-enriched (-)-mandelic acid was dissolved in 10 mL of absolute ethanol. Using a 1 dm polarimeter tube, the observed optical rotation was found to be-6.8°. What is the specific rotation? 3. Pure (-)-mandelic acid has a specific rotation of -160° (same conditions and temperature as sample above). What is the % optical purity of the sample above?
Calculate the observed rotation for a solution of a substance (2.0 g/mL) that is 80% optically pure. A 2-dm cell is used. The specific rotation for the optically pure substance is 120°.
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Calculate the specific rotation of a solution of a compound (30.0 g/100 mL of solution) that has a measured rotation of +25.25º in a 2.00 dm tube.
The optical rotation of a sample was found to be 0.24° when the concentration was 0.60 g in 10 mL of chloroform and the path length of the cell in the polarimeter was 5 cm. What is the specific rotation for this sample?
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An aqueous solution containing 5.13 g of an optically-pure compound was diluted to 5.00 x 10² mL with water and placed in a 15.0 cm long polarimeter tube. The measured rotation was -2.55° at 25° C. Calculate the specific rotation of the compound. [a]³5 =
A 1.25 g sample of coniine, the toxic extract of hemlock, was dissolved in ethanol and placed in a sample cell with a 5.00 cm pathlength. The observed rotation at the sodium D line was +1.21° and [a]pwas +19.4°. Calculate the volume of ethanol us dissolve the sample. O a. 5.0 mL O b. 10.0 mL O c. 20.0 mL O d. 15.0 mL Save Answer A 1.25 g sample of coniine, the toxic extract of hemlock, was dissolved in ethanol and placed in a sample cell with a 5.00 cm pathlength. The observed rotation at the sodium D line was +1.21° and [a]pwas +19.4°. Calculate the volume of ethanol us dissolve the sample. Oa. 5.0 mL Ob. 10.0 mL Oc. 20.0 mL O d. 15.0 mL Save Answer A 1.25 g sample of coniine, the toxic extract of hemlock, was dissolved in ethanol and placed in a sample cell with a 5.00 cm pathlength. The observed rotation at the sodium D line was +1.21° and [a]pwas +19.4°. Calculate the volume of ethanol us dissolve the sample. Oa. 5.0 mL O b. 10.0 mL O c. 20.0 mL O d. 15.0 mL Save Answer
1. What is the specific rotation of glucose(MW 180) with a density of 1.56g/mL and an angular rotation of +1.24° in a 1dm tube? 2. A 10.0% Atropine solution was analyzed using a polarimeter in a 2 dm tube, the reading from the polarimeter was +1.22° and the solvent alone is +1.20°, calculate its specific rotation. 3. An Aspirin solution was placed in an oven at 60°C. The absorbance was taken every month for 3 months. The kinetic profile equation is y= -0.0165x – 1.205. If Aspirin was manufactured November 26, 2021, what is its expiration date?
A solution is prepared by dissolving 678 mg of testosterone in 20 mL of ethanol. The sample was placed in a 10 cm long cuvette. The observed rotation of the sample at 25oC is + 13.8o. Calculate the specific turnover of testosterone, show the calculations.
A 23.9061 g of Ethambutol hydrochloride was diluted with 100 mL of water and was analyzed in a 1.0 dm polarimeter tube. What is the specific rotation if the observed rotation using a D-line sodium lamp at a 589 visible wavelength and at 25°C is +1.53°. Answer the following: Calculate for the specific rotation of the sample What is the monograph specification for the specific rotation of ethambutol? Disposition