# AMPHIPROTIC SPECIES

WHAT ARE AMPHIPROTIC SPECIES?

Note by Abhijeet Verma
6 years, 2 months ago

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Amphiprotic species are those which can act as both acid and base by accepting or donating proton. For example, $HSO_{4}^{-}$ is an amphiprotic species.

• $\color{#D61F06}{HSO_{4}^{-}+H^{+}\rightarrow H_{2}SO_{4}}$

$\color{#20A900}{\text{Working as base}}$

(Although equilibrium constant $(K_{b})$ is very small in this reaction, as $H_{2}SO_{4}$ is a strong acid.)

• $\color{#D61F06}{HSO_{4}^{-}+OH^{-}\rightarrow SO_{4}^{2-}+H_{2}O}$

$\color{#20A900}{\text{Working as acid}}$

(Equilibrium constant is better in this case, as $H_{2}SO_{4}$ is a dibasic strong acid, and it furnishes both $H^{+}$ easily)

- 6 years, 2 months ago

Just checked on Google. Both our definitions are correct. These are the species that can donate a proton and can act as both acids and bases.

- 6 years, 2 months ago

They must also be capable of accepting proton

- 6 years, 2 months ago

Well, not necessary. Your statement is true only when talking about Arrhenius acids, but not about the other two types.

- 6 years, 2 months ago

Look up on Wikipedia! Amphoteric behaves as both acids and bases! While amphiprotic are those amphoteric species which do so by accepting and donating H+

- 6 years, 2 months ago

These species are the name given to those Acids, especially Arrhenius Acids, which are capable of releasing an H(+ve) ion. For example HCl is an amphiprotic acid, as it can readily release an H(+ve) ion. (SO4)2- is not an amphiprotic species, as it does not have an H+ ion to release.

- 6 years, 2 months ago

Are you sure dude? I guess you are mistaking!

- 6 years, 2 months ago

Well, if you are saying that they can act as both acid and bases, then what are amphoteric species like Aluminium oxide and Zinc oxide??

- 6 years, 2 months ago

Yeah! They are some typical amphoteric species!

$Al_{2}O_{3}+NaOH\rightarrow NaAlO_{2}+H_{2}O$ $Al_{2}O_{3}+HCl \rightarrow AlCl_{3}+H_{2}O$

- 6 years, 2 months ago

HCl is not amphiprotic!!

- 6 years, 2 months ago