Ammonia (NH3) acts as a base by bonding with H+ ions in a solution to form NH4+. This is different from other strong bases wich increase the ph level of a solution by contributing OH- ions.
Are there any acids that function by bonding directly with OH- much in the same way the ammonia bonds with H+?
This would effectively increase the ratio of H+ ions in a solution and lower the solutions ph. Such a substance would be considered acidic. Are there any real examples of such a substance?
2006-09-08 08:20:49 · 6 answers · asked by thatengineer 1 in Science & Mathematics ➔ Chemistry
Most transitional metals will lower the pH of a solution to some degree. Aluminum will actually coordinate with several water molecules, and a H+ will come free from one of the waters. The example of Iron(III) given above is also a good one.
However, in the strictest sense of how you asked your question, I don't think there is anything quite like what you're imagining. NH3 is an example of a weak base. It increases the ratio OH- ions in solution by reacting with H+. There are no real weak acids that do the opposite. (Neither Iron nor Aluminum react directly with OH-, except in excess when the pH is already very high).
2006-09-08 09:38:41 · answer #1 · answered by Duluth06ChE 3 · 0⤊ 0⤋
A substance does not have to contribute H+ or OH- to be an acid or a base. That is only the Arrhenius concept. The Lewis definition is more broad. It defines an acid is an electron-pair acceptor and a base is an electron-pair donor. For example, H2S Hydrosulfuric acid and HS − Hydrogen sulfide ion, are conjugate acid/base pairs (like ammonia and ammonium ion), neither of which contain oxygen.
2006-09-08 08:34:16 · answer #2 · answered by Anonymous · 0⤊ 0⤋
We can divide all the substances you are looking for, into 6 families:
1) Be+2
2) All the cations with a charge > or = +3; e.g. Al+3, Sn+4 ...
3) All transition cations:e.g. Fe+2, Fe+3, Cu+1, ...
4) All the molecules whose central atom did not complete the octet: e.g. BF3; AlCl3
5) All the molecules whose central atom even if completed the octet has free d orbitals: e.g. SnCl4
6) Molecules with multiple polar bond: e.g. CO2
2006-09-08 10:42:19 · answer #3 · answered by Looking for roots 2 · 0⤊ 0⤋
Hydrochloric Acid
2006-09-08 11:46:11 · answer #4 · answered by Tomaso 2 · 0⤊ 0⤋
Yes. Ferric Chloride is an example; although it contains neither OH- nor H+, it binds with OH- in solution, resulting in a solution that's quite acidic.
2006-09-08 08:36:27 · answer #5 · answered by Mr. E 5 · 1⤊ 0⤋
Carbon dioxide, CO2, when dissolved into water, bonds with OH groups to form carbonic acid, H2CO3.
2006-09-08 08:39:24 · answer #6 · answered by DavidK93 7 · 0⤊ 0⤋