Help on 12.45

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Joanna Pham - 2D
Posts: 82
Joined: Fri Apr 06, 2018 10:04 am

Help on 12.45

Postby Joanna Pham - 2D » Thu Jan 17, 2019 9:54 pm

The question asks us to arrange the bases in order of increasing strength based on the pKa values of their conjugate acids (given in paraentheses): ammonia (9.26), methylamine (10.56), ethylamine (10.81), aniline (4.63)

Does anyone happen to know how to solve this? Would I need to convert the pKa value to pKb (with the smallest pKb value corresponding to the strongest base)? Or is there a way to solve this conceptually?

Thanks!

Giselle1B
Posts: 9
Joined: Thu Sep 27, 2018 11:19 pm

Re: Help on 12.45

Postby Giselle1B » Thu Jan 17, 2019 11:00 pm

Since acids and bases follow the conjugate seesaw, I believe that the strongest conjugate acid will tie to the weakest base. I suggest first writing the conjugate acids in increasing order. Then the reverse pattern will tell you the increasing strength of its bases.


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