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?
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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?
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- 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?(iii) Calculate the specific rotation of each enantiomer in a mixture containing 10 mL (0.10 M) of (2S, 3R, 5S) enantiomer and 30 mL (0.10 M) of (2R, 3S, 5R) enantiomer. Given the specific rotation of the mixture = +4.8°.The specific rotation for (-)-methylphenidate is -38° mL g¹ dm¯1. Path length of the polarimeter is 1 dm. 1 You dissolve 0.5 g of a mixture of (-)-methylphenidate and its enantiomer in 4 mL of water. You place the sample into a polarimeter and the observed rotation is found to be -0.2°. What percent of the mixture is composed of (-)- methylphenidate? (Round your answer to the nearest whole percent.) The numerical values in this calculation will change with each attempt. Double check before submitting additional attempts. 17
- (+)-menthol has a specific rotation of +50°. A mixture of (+)-menthol and (-)-menthol in a certain synthetic sample was analyzed as follows. 6.972 g of sample was dissolved to make a 25 mL solution, and then placed in a 10 cm tube. The optical rotation of the solution was -10°. What is the enantiomeric excess of the mixture? Report your answer to the correct number of significant figures. % ee Which enantiomer (+ or -) corresponds to the major enantiomer present? )-menthol What are the percentages of each enantiomer in the mixture? Report your answer to the correct number of significant figures. % (+)-menthol % (-)-mentholThe 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.(R)-Camphor [a]20, = +44.0°/(g/mL)dm %3D A researcher places a 0.5 g/mL sample of camphor into a 1.0 dm cell and determines the observed rotation at 589 nm and 20 °C is +2.2°. What is the enantiomeric excess of (R)-camphor in the sample? 20% 95% 5% 10% 90% 80%
- 28. Calculate the specific rotation of the following compound taken at 25°C using the sodium D line: 1g of sample is dissolved in 20mL of ethanol, the measurement was carried out in 20-cm polarimeter tube, and the observed rotation was equal to 1.25° counterclockwise. A -12.5° 29 Pradios B -22.5° C +12.5° D -0.25° с E -122.5° D F-36.0° G -1.25⁰(-)-Cholesterol has a specific rotation of -32o. A mixture of (+)- and (-)-cholesterol was analyzed by polarimetry, and the observed rotation was 14o. What is the percent composition of the (+) isomer in this mixture?Assume 1 g of sample was dissolved in 1 mL water and the sample cell was 1 dm long.When 0.066 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 20°C (using the D line of sodium) is -0.208°Calculate the specific rotation of cholesterol. specific rotation [a] = i eTextbook and Media
- 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?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?I have a solution of a standard reference molecule and its' enantiomer. I used 25 mg of the mixture and dissolved it in 30 mL of solvent. The pathlength of my tube is 65cm. The specific rotation of the reference material is 100. For my sample, i got+0.25 degrees. How much of my reference molecule is in the solution in % and mg?
