Homebrew PCBs

Maybe this might help:  http://www.qvf.com/en/processsystems_3/Mineral%20Acids/AbsorptionofHydrogenChloride.shtml

It does show the max concentration at ~atmospheric pressure, 1 bar, to be somewhere between 40-45%. 42% looks right.

--- On Tue, 1/19/10, Roger Blair <Roger.Blair@...> wrote:

From: Roger Blair <Roger.Blair@...>
Subject: RE: [Homebrew_PCBs] Re: Reducing concentration of HCl from 10% to 40%
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, January 19, 2010, 9:38 PM







 



  


    
      
      
      Yeah, my brain was saying reduce the solution (by evaporating off the water) to reach a 40% HCl concentration. I did say I know next

to nothing about chemistry! BTW, isn't 40%, 37%, 32%, or 10% all levels of 'concentration' ? There must be something else I'm not

understanding.



Thanks,



Roger



From: Homebrew_PCBs@ yahoogroups. com [mailto:Homebrew_PCBs@ yahoogroups. com] On Behalf Of Adam Seychell

Sent: Tuesday, January 19, 2010 6:03 PM

To: Homebrew_PCBs@ yahoogroups. com

Subject: Re: [Homebrew_PCBs] Re: Reducing concentration of HCl from 10% to 40%



Roger Blair wrote:

> 

> 

> Stefan,

> 

> Yes, there is. Finally after half a dozen different places that only 

> sell 10% HCl, or muriatic acid "replacement" , today I finally

> found a bona fide single purpose pool supply establishment that still 

> carried 2 gallon packs of 32% (Muriatic Acid) HCl for $11,

> same price as the 10% stuff. Several Chemical supply outlets I tried 

> would not sell hazmat to individuals, or wanted $25 or more for

> hazmat shipping charges on top of up to $138 for 37% stuff. I'm going to 

> try the 32% HCl.

> 

> Thanks everyone for the help,

> 

> Roger



Just a note, 32%(wt) HCl is still "concentrated" . You'll be hard pressed 

finding %40 HCl because vapour pressure is so high that the HCl gas will 

quickly escape, then slowing down as concentration drops to more a 

stable %35~%30 (wt).



Also note your post subject line is contradictory.



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