Understanding the optical rotation that we observe in lab is not the same as the specific rotation commonly reported in the literature; a student sets out to explore this on their own. They prepare a 0.083 g/mL sucrose solution, pour it into a 1 dm long optical cell, and measure the optical rotation of this solution to be 5.5 degrees. Use Biot's law to determine the specific rotation of sucrose and then the percent difference in compare this experimentally determined value against the accepted value provided above. Biot's law states www απ [a]lc where a is the observed optical rotation in units of degrees, 1 is the length of the cell in units of decimeters (dm), c is the sample concentration in units of grams per milliliter (g/mL), and [a] is the specific rotation in units of degrees (the formal unit for specific rotation is degrees divided by dmg/mL, but scientific literature uses just degrees). Percent difference = |Experimental value-Accepted value| Accepted value × 100% Compound name D-Sucrose D-Lactose [a] 20 [deg dm-1 cm³ g-1] +66.37 +52.3 Camphor +44.26 Cholesterol -31.5
Understanding the optical rotation that we observe in lab is not the same as the specific rotation commonly reported in the literature; a student sets out to explore this on their own. They prepare a 0.083 g/mL sucrose solution, pour it into a 1 dm long optical cell, and measure the optical rotation of this solution to be 5.5 degrees. Use Biot's law to determine the specific rotation of sucrose and then the percent difference in compare this experimentally determined value against the accepted value provided above. Biot's law states www απ [a]lc where a is the observed optical rotation in units of degrees, 1 is the length of the cell in units of decimeters (dm), c is the sample concentration in units of grams per milliliter (g/mL), and [a] is the specific rotation in units of degrees (the formal unit for specific rotation is degrees divided by dmg/mL, but scientific literature uses just degrees). Percent difference = |Experimental value-Accepted value| Accepted value × 100% Compound name D-Sucrose D-Lactose [a] 20 [deg dm-1 cm³ g-1] +66.37 +52.3 Camphor +44.26 Cholesterol -31.5
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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![Understanding the optical rotation that we observe in lab is not the same as the specific
rotation commonly reported in the literature; a student sets out to explore this on their
own. They prepare a 0.083 g/mL sucrose solution, pour it into a 1 dm long optical cell, and
measure the optical rotation of this solution to be 5.5 degrees. Use Biot's law to determine
the specific rotation of sucrose and then the percent difference in compare this
experimentally determined value against the accepted value provided above.
Biot's law states
www
απ
[a]lc
where a is the observed optical rotation in units of degrees, 1 is the length of the cell in
units of decimeters (dm), c is the sample concentration in units of grams per milliliter
(g/mL), and [a] is the specific rotation in units of degrees (the formal unit for specific
rotation is degrees divided by dmg/mL, but scientific literature uses just degrees).
Percent difference =
|Experimental value-Accepted value|
Accepted value
× 100%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe71f7bea-94c0-494e-933b-0ddb8363a678%2F343868b5-e0be-4ef4-82cb-2accf9f71758%2F9iuazzp_processed.png&w=3840&q=75)
Transcribed Image Text:Understanding the optical rotation that we observe in lab is not the same as the specific
rotation commonly reported in the literature; a student sets out to explore this on their
own. They prepare a 0.083 g/mL sucrose solution, pour it into a 1 dm long optical cell, and
measure the optical rotation of this solution to be 5.5 degrees. Use Biot's law to determine
the specific rotation of sucrose and then the percent difference in compare this
experimentally determined value against the accepted value provided above.
Biot's law states
www
απ
[a]lc
where a is the observed optical rotation in units of degrees, 1 is the length of the cell in
units of decimeters (dm), c is the sample concentration in units of grams per milliliter
(g/mL), and [a] is the specific rotation in units of degrees (the formal unit for specific
rotation is degrees divided by dmg/mL, but scientific literature uses just degrees).
Percent difference =
|Experimental value-Accepted value|
Accepted value
× 100%
![Compound name
D-Sucrose
D-Lactose
[a] 20 [deg dm-1 cm³ g-1]
+66.37
+52.3
Camphor
+44.26
Cholesterol
-31.5](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe71f7bea-94c0-494e-933b-0ddb8363a678%2F343868b5-e0be-4ef4-82cb-2accf9f71758%2F08i1vd_processed.png&w=3840&q=75)
Transcribed Image Text:Compound name
D-Sucrose
D-Lactose
[a] 20 [deg dm-1 cm³ g-1]
+66.37
+52.3
Camphor
+44.26
Cholesterol
-31.5
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