Reaction of Metal salt with Sulphuric acid

[Titan97]

Its given in my book that Sulphuric acid displaces more volatile acid from Metal salts like NaCl.
That is, NaCl + H₂SO₄→ HCl + Na₂SO₄
What does valtility have to do with such reactions?
Or Should I just accept it as a fact?

 

[Bystander]

Label reactants and products with their states/phases at standard conditions.

 

[Titan97]

NaCl is solid, Sulphuric acid is liquid?

 

[Bystander]

And products?

 

[symbolipoint]

Its given in my book that Sulphuric acid displaces more volatile acid from Metal salts like NaCl.
That is, NaCl + H₂SO₄→ HCl + Na₂SO₄
What does valtility have to do with such reactions?
Or Should I just accept it as a fact?

NaCl is fairly soluble in water, and sulfuric acid is very soluble in water, and both are very much ionized when dissolved in water. You have a solution of ions. (I really should check on the solubility of sodium sulfate just to be more thorough and correct in my comment).

 

[Bystander]

As written, reaction is not necessarily in aqueous solution.
Edit: see Sharks and Little Fish, Wolfgang Ott, and/or Das Boot for the aqueous case (chlorine evolution).

 

[Titan97]

Sulphuric acid is not volatile hence it does not come out with HCl gas. Other acids can be used as well. But nonvolatile acide like sulphuric acid is preferred to get pure HCI. Am I correct?

 

[Bystander]

hence it does not come out with HCl gas

Yes. "Pure?" Depends.