Welcome Guest Search | Active Topics |

Tag as favorite
Chemistry Acids & Bases
Options
Previous Topic Next Topic
Kara_4491
#1 Posted : Wednesday, June 19, 2019 10:12:25 PM
Rank: Newbie

Groups: Registered
Joined: 5/14/2019
Posts: 2

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
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
Back to top
Report?
INSTR_Katerina_102
#2 Posted : Monday, June 24, 2019 6:24:51 PM
Rank: Advanced Member

Groups: Registered
Joined: 6/24/2019
Posts: 250

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
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
Back to top
Report?
Kerolos_4875
#3 Posted : Tuesday, June 02, 2020 9:08:53 AM
Rank: Member

Groups: Registered
Joined: 6/2/2020
Posts: 15

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
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!
Back to top
Report?
INSTR_Glen_2
#4 Posted : Wednesday, June 03, 2020 9:29:20 PM
Rank: Member

Groups:
Joined: 5/29/2020
Posts: 17

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
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.
Back to top
Report?
Users browsing this topic
Guest (3)
Tag as favorite
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Clean Slate theme by Jaben Cargman (Tiny Gecko)
Powered by YAF | YAF © 2003-2009, Yet Another Forum.NET
This page was generated in 0.081 seconds.