Drawing the structure of conjugate acid that can be formed

Moderators: Chem_Mod, Chem_Admin

Silvia Huang 3D
Posts: 30
Joined: Fri Sep 25, 2015 3:00 am

Drawing the structure of conjugate acid that can be formed

Postby Silvia Huang 3D » Fri Nov 27, 2015 11:36 am

Hw question 12.127
The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of one of these bases, thymine, is shown below. (a) How many protons can this base accept? (b) Draw the structure of each conjugate acid that can be formed. (c) Mark with an asterisk any structure that can show amphiprotic behavior in aqueous solution

So we look at the number of lone paris to determine a), but how do we figure out the structure of conjugate acid and how do we know if that structure is amphiprotic or not??

Thank you! :)

Shaye Busse 3B
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: Drawing the structure of conjugate acid that can be form

Postby Shaye Busse 3B » Fri Nov 27, 2015 11:57 am

In part a), it should be fairly obvious that thymine will be able to accept two protons. This means for part b), there are two different structures of conjugate bases that can be formed, one with one proton accepted and the other with two. In part c), the structure that has amphiprotic behavior is the one that has the ability to both accept and donate a proton. The only structure that can do this is the one with one open space for a proton and one proton ready to be donated.

Hope this helps!


Return to “Bronsted Acids & Bases”

Who is online

Users browsing this forum: No registered users and 1 guest