RE: Technical Grade Muriatic Acid

I stand corrected. Mine was a wrongly made conclusion - based upon what I
have read in chemfinder. Thanks for clarifying the issue and correcting me.
Everyday something new to learn here :)

-----Original Message-----
From: Etienne Garbaux [mailto:photographeur@softhome.net]
Sent: 07 Ekim 2005 Cuma 21:36
To: alt-photo-process-l@sask.usask.ca
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%.

Best regards,

etienne
Received on Fri Oct 7 13:55:43 2005