symboom
International Hazard
Posts: 1143
Registered: 11-11-2010
Location: Wrongplanet
Member Is Offline
Mood: Doing science while it is still legal since 2010
|
|
extraction of copper nitrate
Learning from the extraction of tetramine copper nitrate using chilled ethanol which worked really well strangly isopropanol and acetone both dont
seem to work
I find the solvent must be souble in water to extract and the salt insouble in the solvent.
ive reacted strontium nitrate with copper sulfate
Removed the strontium sulfate percipitate and left with copper nitrate ive read it can be extracted with ether bit im afraid it might form peroxides
does anyone if this is doable or have an idea of a better solvent
|
|
|
DraconicAcid
International Hazard
Posts: 4334
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
Anhydrous copper(II) nitrate is soluble in ethyl acetate, but I doubt that the hydrated form is.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
|
|
|
annaandherdad
Hazard to Others
Posts: 387
Registered: 17-9-2011
Member Is Offline
Mood: No Mood
|
|
Why don't you just evaporate the water (after filtering the strontium sulfate) to get copper nitrate?
Any other SF Bay chemists?
|
|
|
aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
Member Is Offline
|
|
Currently there is a 250ml beaker of aqueous copper nitrate in my lab which i attempted to recrystallise, twice.
It sits there because i do not know what to do with it.
Boiling the water too far (seems to be a very fine point) causes the whole thing to crystallise into a solid block with some slushy stuff that looks
the same colour as basic copper carbonate on the bottom, and no supernatant liquid at all.
At a guess, water is not a suitable solvent for recrystallising copper nitrate.
|
|
|
Mabus
Wiki Master
Posts: 238
Registered: 3-11-2013
Member Is Offline
Mood: Energetic
|
|
Quote: Originally posted by aga  | Currently there is a 250ml beaker of aqueous copper nitrate in my lab which i attempted to recrystallise, twice.
It sits there because i do not know what to do with it.
Boiling the water too far (seems to be a very fine point) causes the whole thing to crystallise into a solid block with some slushy stuff that looks
the same colour as basic copper carbonate on the bottom, and no supernatant liquid at all.
At a guess, water is not a suitable solvent for recrystallising copper nitrate. |
That green slush seems to have free nitric acid, cause when it touched my skin it instantly turned it yellow.
|
|
|
aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
Member Is Offline
|
|
pale blue ...
|
|
|
Texium
Administrator
Posts: 4583
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
Copper(II) nitrate is deliquescent. You'll never get it to crystallize by letting it sit out in the open. The best way to grow good crystals of it is
to boil it down until you have a concentrated solution and then put it in a desiccator over calcium chloride (and sodium hydroxide if there is excess
nitric acid present), and let it sit there until it has all crystallized. Quickly transfer the crystals to a dry, airtight container for storage and
only open it when you really need to get some out to use.
|
|
|
Texium
|
Thread Moved
8-4-2016 at 12:31 |
DraconicAcid
International Hazard
Posts: 4334
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
| Quote: Originally posted by zts16 | | Copper(II) nitrate is deliquescent. You'll never get it to crystallize by letting it sit out in the open. |
Agreed. I had some lovely crystals forming after dissolving a copper penny in nitric acid, but upon sitting, the solution absorbed enough extra water
to dissolve them all.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
|
|
|
Mabus
Wiki Master
Posts: 238
Registered: 3-11-2013
Member Is Offline
Mood: Energetic
|
|
Well, yeah, mine is more like turquoise.
|
|
|
aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
Member Is Offline
|
|
That would explain it then !
Nice one zts.
I'll put this pot in a dessicator bag and see what happens.
|
|
|
NeonPulse
Hazard to Others
Posts: 417
Registered: 29-6-2013
Location: The other end of the internet.
Member Is Offline
Mood: Isolated from Reality! For Real this time....
|
|
It will take a long time! I had a small vial of the stuff in an hydroxide dessicator box and it took about a month to fully dehydrate. All that effort
was a waste since over time I had opened it for use and it has turned to slush again. If Storing it dry is important then keep in the dessicator.
|
|
|
ave369
Eastern European Lady of Mad Science
Posts: 596
Registered: 8-7-2015
Location: No Location
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by Mabus |
That green slush seems to have free nitric acid, cause when it touched my skin it instantly turned it yellow. |
Yep! I've got these results too. Green acidic mass. It's either excess nitric acid or the copper nitrate hydrolyzes.
Smells like ammonia....
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
