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Kara_4491
#1 Posted : Wednesday, June 19, 2019 10:12:25 PM
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Hi there,

Just wondering if the med reels for acids and bases would be posted. It looks like it went from class 1 to class 3 because class 2 is labelled as organic chemistry. If I am just missing where it is could you direct me to it?

Thanks,

Kara
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INSTR_Katerina_102
#2 Posted : Monday, June 24, 2019 6:24:51 PM
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Hi Kara,

The Med Reels for Acid and Bases should be in Chem/Ochem Lecture 7, as they are organized by the order in the Exam Krackers rather than the Classroom Companion.

Cheers,

Katt
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Kerolos_4875
#3 Posted : Tuesday, June 02, 2020 9:08:53 AM
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Hi! Looking at EK ICE 7 Q 157, I do not understand why the answer is A. How do we know that arginine has a higher pKa and why does this add stability? Thank you!
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INSTR_Glen_2
#4 Posted : Wednesday, June 03, 2020 9:29:20 PM
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In the Henderson-Hasselbalch equation: log [A-] / [HA] + pka = pH.
[A-] represents the concentration of the base while [HA] represents the concentration of the acid. Since the question stem tells us that the ratio of the acid to base = 10:1, it is as saying the concentration of the acid is 10 times that of the base so we can substitute their ratios in the equation to be log [1]/[10]. Hope this helps.
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