## amphiprotic vs. amphoteric [ENDORSED]

Stephanie tran 1J
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

### amphiprotic vs. amphoteric

according to the textbook definition, amphiprotic specifically pertains to water molecules, but I noticed In the homework problems that amphiprotic referred to other compounds as well acting as both proton donors and acceptors; What's the main difference between amphiprotic and amphoteric and is amphiprotic more prevalent to acids and bases?

Cynthia Tsang
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am
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### Re: amphiprotic vs. amphoteric

They are similar but amphiprotic is more specific. Amphiprotic is when something can donate or receive a proton. Amphoteric is when something can act as an acid or a base.

Kyung_Jin_Kim_1H
Posts: 53
Joined: Thu Jul 27, 2017 3:00 am

### Re: amphiprotic vs. amphoteric  [ENDORSED]

An example of what Stephanie said would be water. Water is amphoteric because:
Water as a base: $H2O + HCl \rightleftharpoons H3O^+ + Cl^-$
Water as an acid: $H2O + NH3 \rightleftharpoons NH4^+ + OH^-$
In the above reactions, H+ is being donated/accepted. Hence, water is not only amphoteric, but also amphiprotic.
Other examples of amphiprotic compounds are would be $HSO_{4}^-$ and amino acids with carboxyl groups (--COOH) groups.

On the other hand, while Al2O3 reacts with both acids and bases, it cannot by definition be amphiprotic since it doesn't have H.