AMPHIPROTIC SPECIES

WHAT ARE AMPHIPROTIC SPECIES?

Note by Abhijeet Verma
4 years, 9 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, HSO4HSO_{4}^{-} is an amphiprotic species.

  • HSO4+H+H2SO4\color{#D61F06}{HSO_{4}^{-}+H^{+}\rightarrow H_{2}SO_{4}}

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

(Although equilibrium constant (Kb)(K_{b}) is very small in this reaction, as H2SO4H_{2}SO_{4} is a strong acid.)

  • HSO4+OHSO42+H2O\color{#D61F06}{HSO_{4}^{-}+OH^{-}\rightarrow SO_{4}^{2-}+H_{2}O}

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

(Equilibrium constant is better in this case, as H2SO4H_{2}SO_{4} is a dibasic strong acid, and it furnishes both H+H^{+} easily)

Pranjal Jain - 4 years, 9 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 - 4 years, 9 months ago

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They must also be capable of accepting proton

Pranjal Jain - 4 years, 9 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 - 4 years, 9 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 - 4 years, 9 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 - 4 years, 9 months ago

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Are you sure dude? I guess you are mistaking!

Pranjal Jain - 4 years, 9 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 - 4 years, 9 months ago

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

Al2O3+NaOHNaAlO2+H2OAl_{2}O_{3}+NaOH\rightarrow NaAlO_{2}+H_{2}O Al2O3+HClAlCl3+H2OAl_{2}O_{3}+HCl \rightarrow AlCl_{3}+H_{2}O

Pranjal Jain - 4 years, 9 months ago

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HCl is not amphiprotic!!

Pranjal Jain - 4 years, 9 months ago

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