kaviaari
Hazard to Self
Posts: 80
Registered: 21-12-2005
Location: Finland
Member Is Offline
Mood: Going green
|
|
Cleaning up iron(III)ferrocyanide stains
I made prussian blue in a ground joint erlenmeyer flask. Everything turned out nice, but when it was time to wash the flask the joint seemed to have
sucken the compound in itself (didn't come out with violent brushing and hot water, nor with ethanol or ether). What would be the easiest way of
cleaning this mess up?
[Edited on 9-3-2007 by kaviaari]
|
|
|
Polverone
Now celebrating 21 years of madness
Posts: 3186
Registered: 19-5-2002
Location: The Sunny Pacific Northwest
Member Is Offline
Mood: Waiting for spring
|
|
Dilute HF should do it without damaging the glass or your health.
PGP Key and corresponding e-mail address
|
|
|
Pyridinium
Hazard to Others
Posts: 258
Registered: 18-5-2005
Location: USA
Member Is Offline
Mood: cupric
|
|
Prussian blue
If you had some Geobacter metallireducens they would eat it for you 
I don't think dil. HF is even necessary... dilute HCl should dissolve it without releasing HCN gas (don't use conc. acids).
|
|
|
kaviaari
Hazard to Self
Posts: 80
Registered: 21-12-2005
Location: Finland
Member Is Offline
Mood: Going green
|
|
Hot, dillute HCl-solution worked just fine for me. It needed some brushing but now it is as clean as new.
|
|
|
Texium
Administrator
Posts: 4580
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
I made some Prussian blue a couple days ago and got some stuck in my fritted funnel (I used filter paper to prevent this from happening, but it tore
when I was removing it and some got through). I tried running some dilute HCl through the funnel multiple times as this thread suggests, and while
this seemed to work slightly, the frit is still badly stained. Any other suggestions for getting these stains off would be appreciated. Thanks.
Edit: Well, would you look at that, it's my 1111th post
[Edited on 4-18-2015 by zts16]
|
|
|
Boffis
International Hazard
Posts: 1867
Registered: 1-5-2011
Member Is Offline
Mood: No Mood
|
|
Sodium hydroxide destroys prussian blue almost instantly leaving a residue of fine grained but readily soluble ferric oxide hydrate which is easily
removed with citric acid, oxalic acid, dilute HCl, dilute phosphoric etc.
|
|
|
Texium
Administrator
Posts: 4580
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
Thanks Boffis, that worked perfectly!
|
|
|
The Volatile Chemist
International Hazard
Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
Member Is Offline
Mood: Copious
|
|
Interesting... I've noticed that a solution containing a ferri- o ferro-cyanide and iron compound is oxidized or reduced easily to Prussian blue.
Literally, a residual drop of a solution of Ferric(II) ions and Ferrocyanide ions converts to Prussian blue in minutes, by air oxidation, it seems...
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
