# What acid does the combination of HNO_3 + H_2SO_4 create?

${\text{HNO"_3 + "H"_2"SO"_4 rightleftharpoons "H"_2"O" + "NO"_2^+ + "HSO}}_{4}^{-}$
This is an acid-base reaction, with sulfuric acid (${\text{H"_2"SO}}_{4}$) acting as an acid and nitric acid (${\text{HNO}}_{3}$) acting as a base. After the nitric acid gets protonated, it decomposes to form a water molecule ($\text{H"_2"O}$) and a nitronium ion (${\text{NO}}_{2}^{+}$). The equilibrium lies very much to the left.