$\underset{(\text { Acid })}{{H}_{2} {SO}_{4}}+\underset{(\text { Base })} {HNO} \rightleftarrows {HSO}_{4}^{-}+{H}_{2} \stackrel{\oplus} {NO}_{2}$
${H}_{2} \stackrel{\oplus}N {O}_{3} \rightleftarrows {H}_{2} {O}+\stackrel{\oplus}N {O}_{2}$