✓ Correct At pll 7.2 the glutamic acid (Glu) side chain will carry a charge of -1 (at 3 pH units above the pK, for Glu the side chain will be almost fully ionized whereas the histidine (Hid) side chain will carry a charge of < 0.5 (at pH-PK, the charge on His would be 0.5 since pH 7.2 is above its pK, it will carry less (+) charge as it becomes more deprotonated). As the pll increase to 7.9, the charge on Glu will remain-1 and the charge on His will decrease thus, this salt bridge is predicted to become weaker as pll is raised from 72 to 79 Part B Antify your answer with calculations of partial charges on these amino acid side chains at pll- 7.2. (Hint: Consider lessons from Coulomb's law, and the Henderson Hasselbalch equation) Express your answers using two significant figures separated by a comma

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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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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I need part B

 

Y
Do you predict that this salt bridge will become stronger, become weaker, or be unaffected as pH increases from pH-7.2 to pH=7.97
The salt bridge will become stronger.
The salt bridge will become weaker.
The salt bridge will be unaffected.
Previous Answers
Correct
At pH=7.2 the glutamic acid (Glu) side chain will carry a charge of -1 (at 3 pH units above the pK, for Glu, the side chain will be almost fully ionized whereas the
histidine (His) side chain will carry a charge of < 0.5 (at pH pK, the charge on His would be +0.5; since pH 7.2 is above its pK, it will carry less (+) charge as it
becomes more deprotonated). As the pH increase to 7.9, the charge on Glu will remain-1 and the charge on His will decrease; thus, this salt bridge is predicted to become
weaker as pH is raised from 72 to 7.9.
Part B
Justify your answer with calculations of partial charges on these amino acid side chains at pH 7.2. (Hint: Consider lessons from Coulomb's law, and the Henderson Hasselbalch
equation)
Express your answers using two significant figures separated by a comma
VAS
-0.10, +0.67
Submit Previous Answers Request Answer
?
Transcribed Image Text:Y Do you predict that this salt bridge will become stronger, become weaker, or be unaffected as pH increases from pH-7.2 to pH=7.97 The salt bridge will become stronger. The salt bridge will become weaker. The salt bridge will be unaffected. Previous Answers Correct At pH=7.2 the glutamic acid (Glu) side chain will carry a charge of -1 (at 3 pH units above the pK, for Glu, the side chain will be almost fully ionized whereas the histidine (His) side chain will carry a charge of < 0.5 (at pH pK, the charge on His would be +0.5; since pH 7.2 is above its pK, it will carry less (+) charge as it becomes more deprotonated). As the pH increase to 7.9, the charge on Glu will remain-1 and the charge on His will decrease; thus, this salt bridge is predicted to become weaker as pH is raised from 72 to 7.9. Part B Justify your answer with calculations of partial charges on these amino acid side chains at pH 7.2. (Hint: Consider lessons from Coulomb's law, and the Henderson Hasselbalch equation) Express your answers using two significant figures separated by a comma VAS -0.10, +0.67 Submit Previous Answers Request Answer ?
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