Welcome Guest Search | Active Topics |

Tag as favorite
AAMC section bank passage 6 q#44
Options
Previous Topic Next Topic
Sukham_5277
#1 Posted : Tuesday, August 04, 2020 5:21:54 PM
Rank: Member

Groups: Registered
Joined: 4/10/2020
Posts: 28

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi,
For this question we have to find the moles of NAG3 at equivalence point. At equivalence point moles of titrant = moles of titrand and from what I understand is that NAG3 is the titrant and HEW is the titrand. So I was wondering why ONLY using the concentration and volume of HEW to find the moles of NAG3 at equivalence point gives you the correct answer. Why can't you use NAG3 concentration and volume to find its moles at equivalence point if moles of NAG3 = moles of HEW at equivalence point.

Thanks
Back to top
Report?
INSTR_Katerina_102
#2 Posted : Tuesday, August 04, 2020 10:08:49 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 Sukham,

Could you provide more information on the question? I do not have access to the AAMC questions unfortunately.

Thanks!

Katt
Back to top
Report?
Sukham_5277
#3 Posted : Thursday, August 06, 2020 2:38:23 PM
Rank: Member

Groups: Registered
Joined: 4/10/2020
Posts: 28

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi
Do you know how I can post a screenshot of the passage and question to the forum? My question is easier to understand if you have read the passage.
Back to top
Report?
INSTR_Katerina_102
#4 Posted : Thursday, August 06, 2020 7:31:49 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 Sukham,

I have had to do image hosting or sharing from google drive, but I think it would be most convenient if you could email it to me at katerinadschwab@gmail.com

Thanks!

Katt
Back to top
Report?
Sukham_5277
#5 Posted : Monday, August 10, 2020 2:56:16 PM
Rank: Member

Groups: Registered
Joined: 4/10/2020
Posts: 28

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi Katt
I sent you an email
Back to top
Report?
INSTR_Katerina_102
#6 Posted : Tuesday, August 11, 2020 1:33:58 AM
Rank: Advanced Member

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

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi Sukham,

Thanks for your email. I have attached a solution here, please check its veracity (I don't have the solutions either so I hope it's correct).

The reason that I would use HEW rather than the volume of NAG3 is because the passage only gives you the volume and number of moles for a single injection, and multiple injections are needed for this titration.

You could figure out how many injections it takes to get to the equivalence point, but it's much easier to just look at the graph and realize HEW and NAG3 are in a 1:1 molar ratio at the equivalence point, so you can use the moles HEW = moles NAG3, which is easiest to get through this moles HEW given in the passage.

Please let me know if this is unclear,

Thanks,

Katt
Back to top
Report?
Users browsing this topic
Guest (2)
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 0.096 seconds.