# 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?

• – 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:
$$\ce{NaCl(s) + H2SO4(s) → NaHSO4(s) + HCl(g)}$$
$$\ce{NaCl(s) + NaHSO4(s) → HCl(g) + Na2SO4(s)}$$