BrewCityPolska
Harmless
Posts: 1
Registered: 24-6-2013
Member Is Offline
Mood: No Mood
|
|
Using old lab chemicals
I recently obtained some old reagents and was wondering if they are still okay to use? Any recommendations or info would be greatly appreciated!
Here is what I have.....
DuPont - 2.5L Ammonium Hydroxide ACS 30% (full)
Mallinckrodt - 2.5L Ammonium Hydroxide ACS 58% (3/4 full)
DuPont - 2.5L con Sulfuric Acid ACS (full)
Baker Adamson (B&A) - 2.5L con Sulfuric Acid ACS (full)
*All these bottles are from the 1960's and have been properly stored for their entire life to the best of my knowledge.
*I also am properly storing these bottles in two separate cabinets in a cool, dark, dry place.
|
|
DraconicAcid
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 4298
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
They should be fine. Some of the ammonia may have evaporated, leaving a less concentrated solution, but I don't think it would have "gone bad".
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.
|
|
woelen
Super Administrator
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 7990
Registered: 20-8-2005
Location: Netherlands
Member Is Offline
Mood: interested
|
|
Yes, they will be fine, even after tens of years of storage, provided the bottles are well sealed and the caps are in good condition.
The ammonia 58% probably will be 28%. The maximum concentration of ammonia is just over 30% at room temperature, higher concentrations are not
possible without extreme pressure buildup.
|
|
Endimion17
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 1468
Registered: 17-7-2011
Location: shores of a solar sea
Member Is Offline
Mood: speeding through time at the rate of 1 second per second
|
|
If the bottles are made of glass and there's PTFE lining under the caps, they're pretty much fine. Their contents don't match the specified label
anymore, but they're not contaminated. There might be some glass dissolved in it, though. After all, it's more than 50 years of storage.
|
|