In the chemical equation HNO3 + NaOH —> H2 O + NaNO3, what is the conjugate base?

Conjugate acids and bases are always related by the gain/loss of H(+).
e.g. NH3(g) + H2O(l) = NH4+(aq) + OH-(aq)

base (acid) conj. acid (conj. base)
NH3 is a Bronsted-Lowry base: H(+) acceptor and an Arrhenius base: releases OH-
Base + H+ = conjugate acid
Acid - H+ = conjugate base

HNO3 + NaOH —> H2 O + NaNO3
conjugate base: HNO3

the conjugate base is the deprotonated acid, in this case HNO3

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