Question

$H_{2}O$ is a:

• A. Proton acceptor
• B. Neither proton donor, nor proton acceptor
• C. Proton donor
• D. Both proton donor and proton acceptor

Answer 1

Answer: (D)

$H_{2}O$ is an amphiprotic species, therefore, is both a proton donor and acceptor.

$H_{2}O+H^{+}\to H_3{O}^{+}$
$H_{2}O\to H^{+}+O{H}^{-}$