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AMPHIPROTIC SPECIES

WHAT ARE AMPHIPROTIC SPECIES?

Note by Abhijeet Verma
2 years, 11 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.

  • \(\color{red}{HSO_{4}^{-}+H^{+}\rightarrow H_{2}SO_{4}}\)

\(\color{green}{\text{Working as base}}\)

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

  • \(\color{red}{HSO_{4}^{-}+OH^{-}\rightarrow SO_{4}^{2-}+H_{2}O}\)

\(\color{green}{\text{Working as acid}}\)

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

Pranjal Jain - 2 years, 11 months ago

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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.

Abhineet Nayyar - 2 years, 11 months ago

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They must also be capable of accepting proton

Pranjal Jain - 2 years, 11 months ago

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

Abhineet Nayyar - 2 years, 11 months ago

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@Abhineet Nayyar 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+

Pranjal Jain - 2 years, 11 months ago

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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.

Abhineet Nayyar - 2 years, 11 months ago

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HCl is not amphiprotic!!

Pranjal Jain - 2 years, 11 months ago

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Are you sure dude? I guess you are mistaking!

Pranjal Jain - 2 years, 11 months ago

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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??

Abhineet Nayyar - 2 years, 11 months ago

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@Abhineet Nayyar Yeah! They are some typical amphoteric species!

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

Pranjal Jain - 2 years, 11 months ago

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