Chemistryhard · Past Paper
Which of the following behaves as both a Bronsted acid and a Bronsted base?
A$H_2O$
B$CO_3^{2-}$
C$NH_4^+$
D$Cl^-$
✓ Correct Answer: A — $H_2O$
Water can donate a proton to become $OH^-$ or accept a proton to become $H_3O^+$, making it amphiprotic.
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