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Topic: Preparation of HCl  (Read 11172 times)

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Offline BetaAmyloid

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Re: Preparation of HCl
« Reply #15 on: November 20, 2009, 04:47:35 PM »
Weird... I was always under the impression that sulfuric acid had a pKa around hydrogen iodide.  Don't know where that misinformation came from.

Click :rarrow: pKa Values :larrow: Click

pKa of hydroionic acid is -10 and sulfuric acid is -3.

Thanks Borek!

:D
Discovery consists of seeing what everybody has seen and thinking what nobody has thought - Albert Szent-Györgyi

Offline researcher

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Re: Preparation of HCl
« Reply #16 on: November 21, 2009, 12:59:56 PM »
That works better than the bisulfate method I outlined above, lower temperatures needed.
Of course, conc. sulfuric and solid NaCl are needed.  Aqueous solutions give you nothing.

are you sure it doesn't work with aqueous solutions? I had read somewhere that the industrial method was with aqueous NaCl.

Offline 408

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Re: Preparation of HCl
« Reply #17 on: November 21, 2009, 01:18:05 PM »
It may with concentrated solutions, followed by distilling out the aqueous azeotropic acid (~37%).  Dilute is likely useless for preparatory work(Unless industry has some odd method).  Using concentrated acid and solid NaCl is what I have seen in preparatory books for making solutions of HCl in various solvents.

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