Identifying Acids and Bases

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Jasmine 2C
Posts: 184
Joined: Wed Sep 18, 2019 12:18 am

Identifying Acids and Bases

Postby Jasmine 2C » Sat Dec 07, 2019 1:24 am

Rather than memorizing strong acids and bases (and thus knowing which are weak acids and bases), is there a way to tell from the molecule's structure? Like lone pairs, charges, etc?

Ryan 1K
Posts: 101
Joined: Fri Aug 09, 2019 12:15 am

Re: Identifying Acids and Bases

Postby Ryan 1K » Sat Dec 07, 2019 1:28 am

Yes, if a molecule has a lone pair, it could be used to bond with H+. By donating an electron to the H+, it acts as a Lewis base.

For charges, we know that positive transition metal cations act as acids by weakening the bond between H and O in H2O molecules. We also know that negatively charged anions will likely act as a base since they are more likely to donate electrons rather than accept them.

However, I would suggest memorizing the strong acids and bases because those are very important in determining the strength of their conjugates, which in turn, is used to determine the acid-base behavior of salts.

Maggie Eberhardt - 2H
Posts: 97
Joined: Sat Jul 20, 2019 12:16 am

Re: Identifying Acids and Bases

Postby Maggie Eberhardt - 2H » Sat Dec 07, 2019 1:29 am

If you want to calculate the dissociation constants of the acids/bases then I guess you wouldn't have to memorize which are the strong ones, but considering there are only about six strong acids and the bases follow the trend of groups 1 and 2 on the periodic table, memorization might make your life easier.
That being said, you can also look at the strength of bonds and conjugate base/acid stability in order to determine relative strength and possibly determine from that whether they completely dissociate or not.

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