Amphiprotic species

Recognise species such as water and the hydrogencarbonate and hydrogensulfate ions that can both donate and accept a proton, write equations showing each acting as an acid and as a base, and distinguish amphiprotic from amphoteric.

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Which two species can act both as Brønsted–Lowry acids and as Brønsted–Lowry bases? A. $\ce{H2CO3}$ and $\ce{CO3^{2-}}$ B. $\ce{HCO3-}$ and $\ce{SO3^{2-}}$ C. $\ce{HCO3-}$ and $\ce{HSO3-}$ D. $\ce{H2SO3}$ and $\ce{HSO3-}$

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