[References] The specific rotation, [a]p, for sucrose is +67. What is the observed rotation for a solution of 0.50 g of sucrose in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees. The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is +1.3 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?

[References] The specific rotation, [a]p, for sucrose is +67. What is the observed rotation for a solution of 0.50 g of sucrose in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees. The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is +1.3 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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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.
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.
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?
A 0.26 M solution of an enantiomerically pure chiral compound D has an observed rotation of +0.197° in a 1‑dm sample container. The molar mass of the compound is 132.3 g/mol. a. What is the specific rotation of D? b. What is the observed rotation if this solution is mixed with an equal volume of a solution that is 0.26 M in L, the enantiomer of D? c. What is the observed rotation if the solution of D is diluted with an equal volume of solvent?
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?
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)
Label each molecule with chiral centers (R) and (S). Which ones have more than one?
The specific rotation (s) carvone (at 20°C) is +61. A chemist prepared a mixture of (R) carvone and its enantiomer, and this mixture had an observed rotation of -55. What is the specific rotation of (R)-carvone at 20°C?
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?
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.
Construct a model of methane (CH4) using MolView and answer the following: Can it be superimposed on its mirror image? (Y/N) Does methane contain a plane of symmetry? (Y/N) Is methane chiral? (Y/N)
Build 2‑bromoethan‑1‑ol and its mirror image. 2‑Bromoethan‑1‑ol, which has condensed structural formula BrCH2CH2OH, is also called 2‑bromoethanol. a. Draw the structures of 2‑bromoethan‑1‑ol and its mirror image using wedges and dashed wedges. b. How many stereocentres are present in 2‑bromoethan‑1‑ol? c. Are the molecules chiral? Do they contain planes of symmetry? Briefly explain the evidence for your answer.