Final answer:
HPO4²⁻ is the amphiprotic species among the options given, as it can act both as an acid and a base, illustrated by its ability to donate or accept a proton in chemical reactions.The correct answer is option D.
Step-by-step explanation:
Identifying Amphiprotic Species
An amphiprotic species is one that can act both as an acid and a base, meaning it can donate or accept a proton. The amphiprotic species among the ones you asked about is (d) HPO4²⁻. To illustrate its amphiprotic character, consider the following reactions:
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- As an acid, HPO4²⁻ can donate a proton:
HPO4²⁻(aq) + H2O(l) → H2PO4⁻(aq) + OH⁻(aq)
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- As a base, HPO4²⁻ can accept a proton:
HPO4²⁻(aq) + H3O⁺(aq) → H2PO4⁻(aq) + H2O(l)
The species HPO4²⁻ can react with both acids and bases, showing its capability to either gain or lose a proton. None of the other options provided, (a) H2SO4, (b) NH3, (c) H3O⁺, show amphiprotic behavior as they can only act as acids or bases but not both.The correct answer is option D.