Can Chemicals Go Bad?

ok forget the title, i changed the question ;D For instance, if every saturday i dose my tank:
4.5 ml of magnesium
2.2 ml of iodine
2.2 ml of essential elements
2.2 ml of calcium (this ones every day though)

so my question is, can i make this ahead of time? Like mix all of them together and keep them in a little container with a lid until saturday comes? this would be SO frickin convenient, just to pour a single cup in the water, it takes like 1 second as opposed to sitting there measuring out each of these in front of the tank. It would be premeasured, ahhhh

 

Without a lid? How long has it been in said tupperware?

 

sorry i scraped that question ;D know the answer to the new one?

 

I don't know for sure, but I do know iodine transforms through several stages while in your system. Pre-mixing it with other chemicals may change this process in ways you don't like. I'm in favor of keeping it simple even if it's a pain. I measure and add 5 different things daily.

 

anyone else? lets say i dont use iodine, would it be ok then?

 

wow.... that sounds like a pain...

 

bump