Old Chemicals

[nahrein.yaghoubpour]

Hi Everyone,
I have chemicals dated 1992 that are not been used and I don't know what to do with. What would you do ?

Nahrein

[Lyn]

I have a number of chemicals which are fairly old and which are still in use. I have a bottle of potassium permanganate crystals which are used sparingly for convection experiments. Newer bottles of potassium permanganate have arrived in powder form which is pretty useless to demonstrate convection currents. Copper carbonate isn't going to go off and marble chips just keep on keeping on. I also have manganese dioxide which still reacts to give off oxygen. Sulfur powder remains sulfur powder no matter how old. If it looks okay in the bottle and still reacts the way it should I continue to use it.
However chemicals used for the senior practicals are as new as possible within a five year time frame (ocassionally seven). I would be happy to listen to other peoples opinions. Or to be directed to information regarding chemical shelf life.

Lyn.

[Lyn]

Hi again,
Googled chemical shelf life and came up with two different lists. One is a draft of chemical shelf life put together in 2002. The other is a 2010 chemical list from America. Might give you something to work with. Some of this information will give me back up when I get asked why some of my chemicals appear to be so out of date.
Lyn.

[nahrein.yaghoubpour]

Hi Lyn,
Thank you for your help. I have 4x500g of magnessium nitrate, copper nitrate and potassium chloride. They were here before i came her and donot get used.

Nahrein

[DavidPeterson]

The American list was interesting reading - it contained a list of banned substances, most of which we happily use here in SA.

[Robb]

Hi All,

It's interesting that the US and Aus have different systematic approaches to Hazardous Substances. But You guy's have this topic under control with some very interesting feedback.

Cheers,

Robb.....