[mufan]

If I am correct then I think that HCL is made by bubbling HCL gas through water.  If so, what is the effect of heating HCL?  Does the gas escape at a certain temperature...if so then what temp is this? 

We are doing a reaction in excess HCL and seeing vapors escape the condensor at 60 Deg C.  Can anybody explain this?

[Yggdrasil]

HCl is a gas.  How does temperature affect the solubility of gasses?

[mufan]

heat makes solids more soluble in solvent obviously but I didn't know if gases behaved the same.

[constant thinker]

Gases behave just the opposite. They become less soluble at higher temperatures.

If you want to keep the hydrochloric acid in solution, just cool the reaction system if possible, or increase the pressure (Henry's law).

[Borek]

Note: HCl doesn't behave exactly the same way other dissolved gases do, as it fully disociates. Thus there is (almost) no dissolved HCl, only H⁺ and Cl^- in the solution. Still, it has solubility limit at about 37% w/w (perhaps a little bit more, can't remember right now).

[mufan]

so can you reflux HCL without changing the concentration?

[Borek]

If you need it highly concentrated it will go away.

[AWK]

HCl forms an azeotrope HCl-water  with constant boiling point about 106 C containung about 20 % HCl. Its means during boiling HCl over 20 % concentration you remove HCl with traces of water (fumes with water from air), then the azeotope distillates up to complete evaporating of solution. When you start with HCl below 20 % then you remove some water first with traces of HCl, then the azeotrope distillates.