The specific rotation, [a]p, for (-)-2-butanol is +14. What is the observed rotation for a solution of 1.0 g of (-)-2-butanol in 10 mL of water in a sample tube having a pathlength of 10 cm? 1.4 degrees. The observed rotation of a solution of 1.1 g of a compound in 10 mL of water is -10 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?

Organic Chemistry
8th Edition
ISBN:9781305580350
Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Chapter3: Stereoisomerism And Chirality
Section3.7: Optical Activity—how Chirality Is Detected In The Laboratory
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The specific rotation, [a]p, for (-)-2-butanol is +14.
What is the observed rotation for a solution of 1.0 g of
(-)-2-butanol in 10 mL of water in a sample tube
having a pathlength of 10 cm?
1.4 degrees .
The observed rotation of a solution of 1.1 g of a
compound in 10 mL of water is -10 degrees. If the
pathlength is 10 cm, what is the specific rotation of the
compound?
Transcribed Image Text:The specific rotation, [a]p, for (-)-2-butanol is +14. What is the observed rotation for a solution of 1.0 g of (-)-2-butanol in 10 mL of water in a sample tube having a pathlength of 10 cm? 1.4 degrees . The observed rotation of a solution of 1.1 g of a compound in 10 mL of water is -10 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?
The specific rotation, [a]p, for sucrose is +67. What is
the observed rotation for a solution of 1.0 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 0.75 g of a
compound in 10 mL of water is -2.4 degrees. If the
pathlength is 10 cm, what is the specific rotation of the
compound?
Transcribed Image Text:The specific rotation, [a]p, for sucrose is +67. What is the observed rotation for a solution of 1.0 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 0.75 g of a compound in 10 mL of water is -2.4 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?
Expert Solution
Step 1 Introduction interpretation

Basically there are two questions with two different images and according to guideline I have to solve only first image questions with both parts - 

Interpretation- 

1- To determine the observed rotation for a solution of 1g of (-)-2-butanol in 10 mL of water in  sample tube having path length of 10 cm . The specific rotation of 2-butanol is 14. 

2- To determine the specific rotation of the compound for a solution of 1.1 g of compound in 1mL of water when observed rotation of compound is -10 degree . 

 

Concept- 

To determine the specific rotation and observed rotation in a compound we use a formula that is -

                                                                          αλ  = αC × l 

Where αλ  - Specific rotation 

             α  - Observed rotation 

              C - Concertation of solution in ( g/mL) 

             l - Path length ( in dm ) 

 

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