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Explain a laymen words about the calculation involved in polarimeter
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- 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.(S)-2-Bromobutane has a specific rotation of +23.1°. Suppose that a solution is made by dissolving 20.00 g of (S)-2-bromobutane in 1.00 L total solution. What would be the measured rotation of plane-polarized light sent througha 10.00-cm tube containing that solution?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?
- Bartleem is a chiral molecule. At 70 oC Bartleem is a liquid with a density of 0.722 g/mL. At this temperature and using a 589 nm light source with a 1 dm path length the rotation of light is found to be 71o. What is the optical rotation for Bartleem?If a substance is known to have a specific rotation of -89.3 deg mL/g dm, what is the concentration (in g/mL) of a solution that would give an observed rotation of -25.5 degrees, if the path length of the sample tube was 2.00 dm? (Hint: Rearrange the specific rotation calculation formula)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.
- If a substance is known to have a specific rotation of +20.0 deg mL/g dm, what is the concentration (in g/mL) of a solution that would give an observed rotation of +10.0 degrees, if the path length of the sample tube was 1.00 dm? Can you do this problem in your head?A student isgiven a solution labeled only as 2,3-dihydroxybutane. She used the polarimeter to determine its optical rotation, and found that the solution was not optically active. Draw the absolute configuration of theisomer of 2,3-dihydroxybutane that would give zero optical rotation.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?
- 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.4. For each of the following structures:a. Identify Chiral Centersb. Identify the chiral carbon configuration as R or Sc. Identify internal symmetry centers if they existd. Identify whether the structure is chiral or achirale. Identify mesostructures from existingExplain the term proper rotation in symmetry.