chloric1
International Hazard
Posts: 1070
Registered: 8-10-2003
Location: GroupVII of the periodic table
Member Is Offline
Mood: Stoichiometrically Balanced
|
|
Impure Acetic acid
I have purchased some Acetic acid about a couple of years ago and I never really tested its strength or purity becuase I was using it to patina copper
and to make copper acetate. Well when I had my acetamide synth failure, I put some of the "Glacial" acid into the freezer and to my horror
it would nt freeze even though it was cold enough to freeze pure water! I realized I had crap. I have sinced consulted Langes handbook and there was
no mention of an azetrope with water so I decided a simple boiling was in order. Today I boiled and measured the temperature to find that when it
finally started to boil it was at 128C!! I did this until my original 68 grams of acid became 11 grams and still does not freeze. 
Next I was considering dissolving anhydrous MgSO4 in the stuff and distilling. Any of this sound familiar to anyone? I mean it smells like acetic
acid, it makes good copper acetate but its melting and boiling properties dont jive. May just search for a more reputable source of CH3COOH soon.
Thanks for any information or experiences.
Fellow molecular manipulator
|
|
|
ech310n
Harmless
Posts: 29
Registered: 18-10-2003
Location: Australia
Member Is Offline
Mood: No Mood
|
|
Taking a look at an old MSDS I have, Glacial Acetic Acid (99% Acetic Acid) has a boiling point of 118*C though the melting point stated is 16*C so I
have no idea. I hope this helps anyway.
EDIT: I do not know if you have the equipment to do this but you could try a titration: http://members.tripod.com/~frakir/titrate.htm
[Edited on 12-1-2004 by ech310n]
|
|
|
chloric1
International Hazard
Posts: 1070
Registered: 8-10-2003
Location: GroupVII of the periodic table
Member Is Offline
Mood: Stoichiometrically Balanced
|
|
titration
I have yet to purchase burets but I should get some soon because I need to validate acid and base strenghth before use. I have found on a
photography supply company the ability to purchase the acid at $9 per litre. I have delt with them before and I think they would sell me a quality
product. I want the Glacial acid because I have discovered that it is a useful solvent in organic synthesis. I could use my more impure product for
permanganate oxidations where a water/acetic mixture would be advantageous, otherwise the impure stuff will be used for metallic acetates.
Fellow molecular manipulator
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
