[RobA]

Hi there, I'm doing a project where I need to bubble the gaseous form of HCL through a solution. I understand that dripping hydrocholoric acid into sulfuric acid will cause anhydrous HCL gas to form.

(I'm aware of the dangers and have the necessary equipment to do this safely).

My question is, what amount of each will give me what amount of HCL gas?

For example, if I drip 10 ml 31% muriatic acid into a flask of 90% sulfuric acid, how much HCL gas would be released?

Thanks

[Borek]

Why not H₂SO₄ and NaCl? This is a standard lab procedure.

[RobA]

Why not H₂SO₄ and NaCl? This is a standard lab procedure.

I had heard that H2SO4 and HCL was a little less messy.

What would the procedure for this bethen?

Just put a set amount of table salt into a set amount of sulfuric acid? Is HCL the only byproduct of this reaction?

And how much HCL would be created given a given quantity of both substances?

Thanks

[Borek]

I have no procedure at hand, but it is definitely described in the literature. I guess even Vogel's organic chemistry should have it, as dry HCl is sometimes used in organic synthesis.

Maximum possible amount can be calculated from the reaction stoichiometry (or will be given in the procedure as a practical limit).

[Arkcon]

For example, if I drip 10 ml 31% muriatic acid into a flask of 90% sulfuric acid, how much HCL gas would be released?

Thanks

Borek: said the results will be nearly stoichiometric, that is the best information we can make theoretically.  That means you convert your percentage volumes into grams, then moles, and get products in moles, and convert back to grams.  This is a learning forum, we expect people to want to do this math.

Once you have grams of product, you have to consider that the HCl gas will have some solubility the residual water, and you might want to account for it. Once you have moles of HCl gas, you can even use the ideal gas laws to determine what volume of gas you'll get at a certain temperature and pressure.  Again, since this gas is not ideal, you will have to accept some inaccuracy.

Of course that begs the question, why does it matter, "How much?" and moreover, why do you have to know?  Enough to fill a balloon as the worst nasty party trick ever?  Or do you need hydrogen chloride gas for another reaction?  If so, you'll want to understand the stoichometry of that reaction, to be sure you make enough.