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Molecules or ions which can either donate or accept a proton, depending on their circumstances, are called amphiprotic species. The most important amphiprotic species is water itself.
What is amphiprotic species?
An amphoteric substance in chemistry is a molecule or ion that reacts as both an acid and a base. Depending on whose definitions of acids and bases are being used, this could signify a variety of things. The Greek prefix amphi, which meaning "both," is whence the word "amphoteric" gets its prefix.
Amphiprotic molecules, which have the ability to either donate or absorb a proton (H+), are one kind of amphoteric species. In the context of Brnsted-Lowry acid-base theory, this is what "amphoteric" means. Examples include self-ionizable molecules like water and amino acids and proteins, which have amine and carboxylic acid groups.
Amphoteric compounds called ampholytes have both acidic and basic groups.
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