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Introduction to Acids and Bases

AP Chemistry· difficulty 4/5

Which species is AMPHOTERIC (can act as both acid and base)?

  • A

    Cl−^-

  • B

    HCl

  • C

    HCO3−_3^- (loses H+^+ to give CO32−_3^{2-}; gains H+^+ to give H2_2CO3_3)

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  • D

    Na+^+

Explanation

HCO3−_3^- has both a transferable H and a lone pair. Other amphoteric examples: H2_2O, HSO4−_4^-, HS−^-.

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