metalresearcher
National Hazard
Posts: 758
Registered: 7-9-2010
Member Is Offline
Mood: Reactive
|
|
Funny: an ebay seller warns KOH is an oxidizer ...
This item on ebay
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=200556...
says
! Achtung !
Kaliumhydroxid ist in konzentrierter und mit Wasser verdünnter Form ein starkes und gefährliches Oxidationsmittel und muß mit größter Vorsicht
beachtet werden.
in other words:
! Warning !
Potassium hydroxide is in concentrated state and diluted with water a strong and dangerous oxidizer and should be handled with greatest care.
Funny that they do not warn for the real hazards (caustic / corrosive). I don't think such suppliers are very reliable.
|
|
|
bahamuth
Hazard to Others
Posts: 384
Registered: 3-11-2009
Location: Norway
Member Is Offline
Mood: Under stimulated
|
|
Perhaps even more strange is that the seller lists it as 99.5 %, as it usually never exceeds 90% in purity....
Any sufficiently advanced technology is indistinguishable from magic.
|
|
|
The WiZard is In
International Hazard
Posts: 1617
Registered: 3-4-2010
Member Is Offline
Mood: No Mood
|
|
Quote: Originally posted by bahamuth  | | Perhaps even more strange is that the seller lists it as 99.5 %, as it usually never exceeds 90% in purity.... |
In my a bit out of date J.T. Baker catalogue ...
Sodium Hydroxide, Pellets NF
Meets NF Requirements
Assay (NaOH) 95-100%
Meets BP, PhEur Chemcial Specifications
Assay (NaOH) 97.0-100.5% [sic]
Meets JP Chemical Sepcifications
Assay 95.0-101.0% [sic]
Baker Analyzed ACS Reagent
Assay (NaOH) (by acidimetry) min. 98%
Now we can all go back to sleep.
|
|
|
ScienceSquirrel
International Hazard
Posts: 1863
Registered: 18-6-2008
Location: Brittany
Member Is Offline
Mood: Dogs are pets but cats are little furry humans with four feet and self determination! 
|
|
Purity data on potassium hydroxide often excludes water.
For instance Sigma Aldrich list semi conductor grade potassium hydroxide as 99.99% but the small print reveals that it contains ca 15% water.
http://www.sigmaaldrich.com/catalog/ProductDetail.do?lang=en...
A quick perusal of their other grades reveals that they are 85 - 90% pure but the major impurity is water.
|
|
|
The WiZard is In
International Hazard
Posts: 1617
Registered: 3-4-2010
Member Is Offline
Mood: No Mood
|
|
Ooop's Sorry. The original question was KOH not NaOH. I have to stop putting magic mushrooms on
my pizza before posting.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
