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(C) species that acts as both a Bronsted acid and a base is called an amphoteric species. It must be able to donate a proton $(H^+)$ and accept a prot

Vedclass · Accepted Answer

$HPO_4^{2-}$

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(C) species that acts as both a Bronsted acid and a base is called an amphoteric species. It must be able to donate a proton $(H^+)$ and accept a proton $(H^+)$.$HPO_4^{2-}$ can accept a proton to form $H_2PO_4^-$ (acting as a base) and donate a proton to form $PO_4^{3-}$ (acting as an acid).$HPO_4^{2-} + H_2O \rightleftharpoons H_2PO_4^- + OH^-$$HPO_4^{2-} + H_2O \rightleftharpoons PO_4^{3-} + H_3O^+$$H_2PO_2^-$ is the conjugate base of $H_3PO_2$ (a monobasic acid) and cannot donate any more protons.$HPO_3^{2-}$ is the conjugate base of $H_2PO_3^-$ (derived from the dibasic acid $H_3PO_3$) and cannot donate any more protons.

$A$. $HI$	$(i)$ $3.2 \times 10^9$
$B$. $HF$	$(ii)$ $3.5 \times 10^{-4}$
$C$. $HCl$	$(iii)$ $1.3 \times 10^6$
$D$. $HBr$	$(iv)$ $1.0 \times 10^9$

Which one of the following species acts as both Bronsted acid and base?

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$A$. $HI$ $(i)$ $3.2 \times 10^9$
$B$. $HF$ $(ii)$ $3.5 \times 10^{-4}$
$C$. $HCl$ $(iii)$ $1.3 \times 10^6$
$D$. $HBr$ $(iv)$ $1.0 \times 10^9$

The correct match is:

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