Concept explainers
(a)
Interpretation : The specific rotation needs to be determined.
Concept Introduction : The rotation of the light is ratio of the optical rotation to the product of the length and concentration of the solution.
(b)
Interpretation : The value of optical rotation of the solution needs to be determined.
Concept Introduction : Optical rotation is association of the plane about the route of the motion when the light passes through the material and light is linearly polarized.
(c)
Interpretation : The concentration of the solution needs to be determined.
Concept Introduction : The optical rotation is a phenomenon of the light rotation through the material due to the linearly polarized light. It depends on the length of the cell, and
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Organic Chemistry: Structure and Function
- stereochemistry question: Calculate the specific rotations of the following samples taken at 25 °C using the sodium D line. (a) 1.00 g of sample is dissolved in 20.0 mL of ethanol. Then 5.00 mL of this solution is placed in a 20.0-cm polarimeter tube. The observed rotation is 1.25° counterclockwise. (b) 0.050 g of sample is dissolved in 2.0 mL of ethanol, and this solution is placed in a 2.0-cm polarimeter tube. The observed rotation is clockwise 0.043°. refer to the question belowarrow_forwardDetermine the R/S configuration of each chiral center in the molecules shown below. (Do not include lone pairs as an attachment when identifying the chiral centers.)arrow_forwardThe specific rotation, [a]p, for (-)-malic acid is -27. What is the observed rotation for a solution of 1.2 g of (-)-malic acid 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 +0.75 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? 9 more group attempts remaining Submit Answer Retry Entire Grouparrow_forward
- Use compounds D and E shown below to answer this question. What would be the observed rotation of a 4:1 mixture of D:E if pure compound E has a specific rotation of +12°? Show how you arrived at your answer. (Use the back if necessary) CI, Br Br .CI compound D compound Earrow_forwardView Policies Current Attempt in Progress When 0.234 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 +0.599°. Calculate the specific rotation of MSG. specific rotation = [a] = i eTexthook and Mediaarrow_forwardThe specific rotation, [a]p, for (-)-malic acid is -27. What is the observed rotation for a solution of 0.75 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees. The observed rotation of a solution of 1.4 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? 9 more group attempts remaining Submit Answer Retry Entire Grouparrow_forward
- a)Name this molecule. Draw another stereoisomer, labelling each chiral atom with the proper descriptor (R or S). b) What is the stereochemical relationship between 2a and the one you drew? c) If the optical rotation of the S,S isomer is +15.1°, what is the optical rotation of the stereoisomer you drew? d) Can this molecule and the isomer you drew be separated by distillation? Explain why, or why not.arrow_forwardIf the sample of the pure R enantiomer of a molecule has a specific rotation of -40 degrees and your mixture of that molecule has an 82% ee S, what is the observed specific rotation of your sample?arrow_forwardDescribe how a polarimeter can be used to solve the following two problems: a. Differentiate between the type of sugar (D- fructose, D-glucose, D-galactose, D-allose, Sucrose, maltose used in a compound. b. Determine the enantiomeric excess of an enantiomer in a non-racemic mixture?arrow_forward
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