# Sodium chloride + sulfuric acid [closed]

Why does sulfuric acid displace more volatile acids from salts? My textbook says that sulfuric acid can displace more volatile acids from metal salts. How is $\ce{HCl}$, which is not even a reactant, 'displaced' from $\ce{NaCl}$, as there is no $\ce{HCl}$ to be displaced?

## closed as unclear what you're asking by Todd Minehardt, bon, M.A.R. ಠ_ಠ, Geoff Hutchison, JanSep 29 '15 at 17:25

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• Please avoid using Latex in titles due to searching issues – bon Sep 29 '15 at 16:35
• – JM97 Sep 16 '16 at 6:46

How is $\ce{HCl}$, which is not even a reactant, 'displaced' from $\ce{NaCl}$, as there is no $\ce{HCl}$ to be displaced?
Well, there will be some $\ce{HCl}$ due to a well-known chemical reaction which is used both in the lab as well as in production to get the hydrogen chloride:
$$\ce{NaCl(s) + H2SO4(s) → NaHSO4(s) + HCl(g)}$$
$$\ce{NaCl(s) + NaHSO4(s) → HCl(g) + Na2SO4(s)}$$