Re: Technical Grade Muriatic Acid

----- Original Message -----
From: "Etienne Garbaux" <photographeur@softhome.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Friday, October 07, 2005 1:35 PM
Subject: RE: Technical Grade Muriatic Acid

> > The chemfinder.com page on HCL says it's a gas in the pure state and its
> >solubility is 62gr in 100mL water. So, the ~31% variant is actually half
> >strength HCl, not concentrated (62%) HCl.
>
> Actually, 62g in 100ml isn't 62/100 or 62% -- it is 62/162 or 38.27%,
> assuming that 1 ml of water = 1 g, which is not quite true -- the
> solubility figure is not likely given at the standard temperature.
>
> Concentrated HCl is generally in the 38% neighborhood, but is "fuming" at
> that concentration (i.e., gives off HCl gas, which is very corrosive).
> Fuming is greatly reduced under 34%, which is why hardware-store Muriatic
> Acid is 31.45%. The HCl of commerce (i.e., that which is used
> industrially) is likewise usually around 32%.
>
So what is the correct proportion to use to make Aqua Regia? Does using a
less concentrated form simply give a less concentrated Aqua Regia mix (read:
weaker)?
Received on Fri Oct 7 18:11:25 2005