What is the bronsted acid of NO2 - + H2O HNO2 + OH-

Answer;

H2O - Bronsted Acid

Explanation; Bronsted-Lowry acids are H + donors, while Bronsted-Lowry bases are H + acceptors. A reaction of a Bronsted-Lowry acid and a Bronsted base is a neutralization reaction that is characterized by H + transfer. The above reaction is an example of base ionization or dissociation where;

B (aq) + H2O (l) → BH + (aq) + OH - (aq)

That is; Base + Acid will give a conjugate acid + hydroxide ion

In our case; NO2 - + H2O → HNO2 + OH- ; H2O is the H + donor and thus, it is a Bronsted Acid.