Which of these are a bronsted acid, a bronsted base or are both the bronsted acid and the bronsted base?

PO4^3-

ClO2-

NH4+

HCO3-

H2PO4-

We can classify the ion molecules as follows:

PO4^3 - = Bronsted Base

ClO2 - = Bronsted Base

NH4 + = Bronsted Acid

HCO3 - = Both

H2PO4 - = Both

For a Bronsted-Lowry acid and bases, an acid is a proton (hydrogen ion) donor. A base is a proton (hydrogen ion) acceptor. Hope this answers the question. Have a nice day.