Which is not amphoteric?

  • Option 1)

    HSO_{4}^{-}

  • Option 2)

    HCO_{3}^{-}

  • Option 3)

    H_{2}PO_{4}^{-}

  • Option 4)

    HCOO^{-}

 

Answers (1)
P Plabita

As learnt in

Ionization reaction of dibasic acid -

H_{2}X(aq)\rightleftharpoons H^{+}(aq)+H\bar{X}(aq)


\bar{H}X(aq)\rightleftharpoons H^{+}(aq)+X^{2-}(aq)

- wherein

K_{a1}=\frac{[H^{+}]\:[\bar{H}X]}{[H_{2}X]}


K_{a2}=\frac{[H^{+}]\:[X^{2-}]}{[{H}X^{-}]}


K_{a1}\:and\:K_{a2}   are called first and second ionization constant.

 

Of all the species given, HCOO^{-} is the only one that cannot donate a proton and act as an acid. All of these can accept a proton thereby acting as a lease.


Option 1)

HSO_{4}^{-}

This solution is incorrect.

Option 2)

HCO_{3}^{-}

This solution is incorrect.

Option 3)

H_{2}PO_{4}^{-}

This solution is incorrect.

Option 4)

HCOO^{-}

This solution is correct.

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