Acid-Base Conjugate Pairs with multiple Products


> 
> Identify the acid-base conjugate pairs in the following reactions:
>  $$\ce{H\_2SO\_4 + HNO\_3 <=> HSO\_4^- + NO\_2^+ + H\_2O}$$
> 
> 
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The obvious acid base conjugate pair is $\ce{H\_2SO4}$ and $\ce{HSO\_4^-}$.


If $\ce{NO\_2^+}$ and $\ce{H\_2O}$ were together, the second acid-base pair would be quite obvious. But the two aren't. What would be the conjugate-acid pair of $\ce{HNO\_3}$ in this case?


