Instead of HCl why should I use H2SO4+NaCl?

[mooncrater]

Homework Statement

In my book there is a reaction given that is:
MnO₂+4HCl→MnCl₂+Cl₂+2H₂O
To prepare Cl₂.
And then it is given that in place of HCl, a mixture of H₂SO₄+NaCl is used... but why?

Homework Equations

None

The Attempt at a Solution

NaCl+H₂SO₄→NaHSO₄+HCl
We here also get HCl. So why should we not use HCl directly? Why should be prefer the latter method?

 

[SteamKing]

One reaction gives free chlorine gas and one doesn't. You select the reaction appropriate to the end products you wish to obtain.

 

[mooncrater]

One reaction gives free chlorine gas and one doesn't.

But both GIVE Cl₂ as a product. It is just that the later one gives HCl which then reacts with MnO₂. (Thats what I think. ) to give Cl₂.

 

[SteamKing]

But both GIVE Cl₂ as a product. It is just that the later one gives HCl which then reacts with MnO₂. (Thats what I think. ) to give Cl₂.

That wasn't clear from the way the reaction equations were presented.