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Posted: Sun Dec 08, 2019 9:40 pm
How can you tell if a molecule is amphoteric?
Posted: Sun Dec 08, 2019 9:43 pm
if the molecule in question is able to both accept a proton and give a proton then it is amphoteric as a general rule.
Posted: Sun Dec 08, 2019 11:26 pm
Can react as a base and acid and examples include amino acids and proteins, which have amine and carboxylic acid groups, and self-ionizable compounds such as water.
Posted: Sun Dec 08, 2019 11:32 pm
A molecule is amphoteric if it can react as an acid or a base in an acid-base reaction.
Posted: Sun Dec 08, 2019 11:33 pm
adding on to the above replies, an example of a common amphoteric molecule is water. Water can act as either an acid or base depending on the reactions.
Posted: Sun Dec 08, 2019 11:35 pm
Amphoteric and amphiprotic are two terms easily confused together. Amphoteric describes any molecules with both acidic and basic properties. As a very general definition, acidic and basic properties here can refer to any acids and bases definitions, including Lewis, Bronsted, etc. On the other hand, Amphiprotic describes molecules being a proton donor and a proton acceptor at the same time. As you can see, this definition fits specifically into the definition of Lewis acids and bases, compared to the more broad definition of amphoteric.
In short, amphiprotic molecules are specific cases of amphoteric molecules because amphiprotic molecules are specifically Lewis acids and bases.
Posted: Mon Dec 09, 2019 3:10 am
To add onto the last answer, something that is amphiprotic (can give off an H+ or accept it) will be amphoteric (in reactions could act as acid and a base) but it wont be true the other way around.
Posted: Mon Dec 09, 2019 9:37 am
All amphiprotic species must be amphoteric, but the converse is not true.