Calculate 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.
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Q: what is the specific rotation of the compound?
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Calculate 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.
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- 2. The observed rotation of a compound, X (14.0g dissolved in water to make 100ml. of solution) in a polarimeter tube of length 30cm is +10.5°. What is the specific rotation of X?6. Calculate the specific rotation of a 1.00 g sample dissolved in 20.0 mL of ethanol when 5 mL of this solution are placed in a 200 cm polarimeter tube. The observed rotation is 1.25° counterclockwise.The specific rotation of vitamin C ( using the D line of sodium, at 20°C) is +24. Predict what the observed rotation would be for a solution containing 0.100 g of vitamin C dissolved in 10.0 ml of ethanol and placed in a sample cell with a length of 1dm.
- The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is +0.75 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?1. When 0.247 g of monosodium glutamate (MSG) is dissolved in 10.0 mL of water and placed in a sample cell 10.0 cm in length, the observed rotation at 20°(using the D line of sodium) is +0.632°. Calculate the specific rotation of MSG. 2. When 0.095 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 at 20°C (using the D line of sodium) is -0.299°.Calculate the specific rotation of cholesterol.3. The specific rotation of L-dopa in water (at 15°C) is -39.5. A chemist prepared a mixture of L-dopa and its enantiomer, and this mixture had a specific rotation of -34. Calculate the % ee of this mixture. 4. The specific rotation of vitamin B7 in water (at 22°C) is +92. A chemist prepared a mixture of vitamin B7 and its enantiomer, and this mixture had a specific rotation of +18. Calculate the % ee of this mixture.1) The major component of orange oil is limonene which has a specific rotation of +115.5°. Compare this value with the specific rotation you calculated from your own sample. Is your sample pure? Describe a method you might use to determine the composition of your mixture. My specific rotation was +17.425 2) Many organic reactions result in mixtures of enantiomers in equal amounts, a racemic mixture, which results in zero observable rotation. Chemists have developed selective reactions that result in more of one enantiomer than the other (enantiomer excess). If a mixture of R and S enantiomers has an observed rotation is +25° and the S enantiomer has a +45° rotation, calculate the % enantiometric excess and composition of the mixture.
- An aqueous solution containing 10 g of an optically pure compound was diluted to 500 mL with water and was found to have a specific rotation of −121º. If this solution were mixed with 500 mL of a solution containing 3 g of a racemic mixture of the compound, what would the specific rotation of the resulting mixture of the compound? What would be its optical purity?A certain compound has a specific rotation of -43.2o (c = 5, toluene). What is the observed rotation of a sample of 1.24 g of the enantiomer of this compound when diluted to a concentration of 1.00 g ml-1 in the same solvent? Example 30 In his classic studies of stereochemistry and optical activity in organic compounds, Pasteur measured the optical activity of many solutions. For the naturally occurring enantiomer of tartaric acid, [α]D20 = +12.4o (c = 20, H2O). What can be concluded about the ratio of tartaric acid enantiomers present in the solution if the observed rotation is (i) α = -6.0o, or (ii) α = 0o?Calculate the specific rotation of 120mL methyl salicylate (C8H8O3) if the molar rotation is -1.50°. (MW= 152)
- The observed rotation for 100 mL of an aqueous solution containing 1 g of sucrose, placed in a 2-decimeter sample tube, is +1.33 degrees at 25 degrees C (using sodium lamp). Calculate the specific rotation of sucrose.The specific rotation, [a]p, for (-)-2-butanol is +14. What is the observed rotation for a solution of 3.3 g of (-)-2-butanol in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees . The observed rotation of a solution of 0.75 g of a compound in 10 mL of water is -6.9 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?When 0.300 g of sucrose is dissolved in water to a total volume of 10.0 mL and placed in a sample cell 10.0 cm in length, the observed rotation is +1.99° (using the D line of sodium at 20 °C). Calculate the specific rotation of sucrose.
