Question

Which compound can act as both a Brønsted-Lowry acid and a Brønsted-Lowry base?

a. water
b. oxygen
c. sodium hydroxide
d. hydrochloric acid

Answer 1

A: water

Step-by-step explanation:

Answer 2

Water.
In certain circumstances, water acts as a proton donor.
e.g NH3(aq) + H2O(l) --> NH4+(aq) + OH-(aq)

In other circumstances, water can act as a proton acceptor.
e.g HNO3(aq) + H2O(l) --> H3O+(aq) + NO3-(aq)