The amino acid (S)-alanine has the physical characteristics listed under the structure. ÇOOH a. What is the melting point of (R)-alanine? b. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (A)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine? d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine? e. Label each of the following as optically active or inactive: a solution of pure (S)-alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine. CH NH2 (S)-alanine [a) = +8.5 mp = 297 °C
The amino acid (S)-alanine has the physical characteristics listed under the structure. ÇOOH a. What is the melting point of (R)-alanine? b. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (A)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine? d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine? e. Label each of the following as optically active or inactive: a solution of pure (S)-alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine. CH NH2 (S)-alanine [a) = +8.5 mp = 297 °C
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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![The amino acid (S)-alanine has the physical characteristics listed under the structure.
ÇOOH
a. What is the melting point of (R)-alanine?
b. How does the melting point of a racemic mixture of (R)- and (S)-alanine
compare to the melting point of (S)-alanine?
c. What is the specific rotation of (A)-alanine, recorded under the same
conditions as the reported rotation of (S)-alanine?
d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine?
e. Label each of the following as optically active or inactive: a solution of pure
(S)-alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains
75% (S)- and 25% (R)-alanine.
CH
NH2
(S)-alanine
[a) = +8.5
mp = 297 °C](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd1c0ab63-c383-487f-a083-0c2287db0fca%2F04c724ac-bd89-4e5e-bab7-6b552c22abd5%2Fkfhsbw7_processed.png&w=3840&q=75)
Transcribed Image Text:The amino acid (S)-alanine has the physical characteristics listed under the structure.
ÇOOH
a. What is the melting point of (R)-alanine?
b. How does the melting point of a racemic mixture of (R)- and (S)-alanine
compare to the melting point of (S)-alanine?
c. What is the specific rotation of (A)-alanine, recorded under the same
conditions as the reported rotation of (S)-alanine?
d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine?
e. Label each of the following as optically active or inactive: a solution of pure
(S)-alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains
75% (S)- and 25% (R)-alanine.
CH
NH2
(S)-alanine
[a) = +8.5
mp = 297 °C
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