pKa of conjugate acid relating to strength of base

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briannam_1F
Posts: 35
Joined: Wed Sep 18, 2019 12:18 am

pKa of conjugate acid relating to strength of base

Postby briannam_1F » Mon Jan 20, 2020 4:25 pm

My friend and I are having trouble understanding the homework question 6C.13.

Can someone please clarify what the question is asking? We were given pKa and we decided from the question to solve for pKb, but now were are unsure what these values mean and how we should rank them.

Thanks in advance!

sarahsalama2E
Posts: 164
Joined: Fri Aug 30, 2019 12:16 am

Re: pKa of conjugate acid relating to strength of base

Postby sarahsalama2E » Mon Jan 20, 2020 4:33 pm

remember that pka+pka= 14. we need the pkb values because the question asks us to arrange the BASES in order of strength based on the pkA values of their conjugate acids. the lower the pKa/pKb the stronger of an acid or a base it is. hope that helps you.

Yiyang Jen Wang 4G
Posts: 76
Joined: Wed Nov 21, 2018 12:18 am

Re: pKa of conjugate acid relating to strength of base

Postby Yiyang Jen Wang 4G » Mon Jan 20, 2020 7:02 pm

We need pka to solve for pkb, and then we can rank the bases in order of strength. The larger the pka value : the smaller the pkb, the weaker the acid, and the stronger the conjugate base. Therefore ethylamine is the strongest base.


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