A sample of pure (S)-2-butanol was placed in a polarimeter tube with a 20 cm path length. Using the D-line of a sodium lamp, the observed rotation at 23 °C was a = +104°. The density of this compound is 0.756 g mL-. What is the specific rotation of (R)-2-butanol?
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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?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?Calculate the specific rotation of (2R,3R)-tartaric acid based on the following observation: A 0.856 g sample of the pure acid was diluted to 10.0 mL with water and placed in a 1.00 dm polarimeter tube. The observed rotation using the 589 nm line of a sodium lamp at 20.0 oC was α = +1.06o.
- A solution of 0.50 g of (-)@epinephrine dissolved in 10.0 mL of diluteaqueous HCl was placed in a 20-cm polarimeter tube. Using the sodium D line, the rotation was found to be -5.1° at 25 °C. Determine the specific rotation of epinephrine.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?you isolate limonene from yuor orange peel via steam distillation and measure the optical rotation . your sample has an optical rotation of [a]20 = +77.3, but the literature value of R-(+)-limonene is [a]20 = +115.5 , what is the most likely reason for the discrepancy
- A new chemical reaction produced a mixture of two enantiomers. When 9.0 g of this mixture was dissolved in 50.0 mL of CH2Cl2 in a sample cell 20 cm long, the optical rotation was found to be +18.0º. The known specific optical rotation of one of the enantiomers is –74.0. What was the percentage of the (+) and (–) enantiomers produced by the reactionViktor 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?3 @Calculate (a) the optical purity of a mixture of 3.5 g (-) - menthol and 2.7 g (+) - menthol. (b) What is the observed rotation of the mixture if the specific rotation of (-) - menthol is -48.
- A 1.62 M solution of (R)-2-butanol is mixed with an equal volume of a 0.810 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long. What observed rotation is expected? The specific rotation of (R)-2-butanol is –13.9 degrees mL g- dm-'. a = degCalculate the specific rotation of a pure sample of a secondary alcohol that gave an observed rotation of + 15.8o in a cell 20.0 cm long. The density of alcohol is 0.848 g / mL.(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°.