Moderators: Chem_Mod, Chem_Admin

Suraj Doshi 2G
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am


Postby Suraj Doshi 2G » Thu Jan 16, 2020 11:28 am

I'm having a bit of trouble figuring out how to arrange the molecules for increasing base strength within problem 13.

The problem states: Arrange the following bases in order of increasing strength on the basis of the pKa values of their conjugate acids, which are given in parentheses: (a) ammonia (9.26); (b) methylamine (10.56); (c) ethylamine (10.81); (d) aniline (4.63; see Exercise 6C.12). Is there a simple pattern of strengths?

Can someone help me figure this out?

Rita Chen 1B
Posts: 112
Joined: Sat Jul 20, 2019 12:15 am

Re: 6C.13

Postby Rita Chen 1B » Thu Jan 16, 2020 12:40 pm

I think that the stronger the acid or base, the weaker the conjugate base or acid. So I think you are supposed to use the pKa to determine how strong it is and then compare its conjugate base or acid to the rest.

Posts: 104
Joined: Thu Jul 25, 2019 12:17 am
Been upvoted: 1 time

Re: 6C.13

Postby VPatankar_2L » Thu Jan 16, 2020 1:15 pm

You could use the pKa to find the pKb by subtracting pKa value from 14. The lower the pKb value, the stronger the base.

Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 2 guests