Hi Chemists! Maybe you can help with this.
Today on the discard pile at work I found a 4 oz., sealed bottle of Fisher branded Stannous Chloride dihydrate. Since I know that SnCl2 can be used for reduction sensitization and as a foggant for E-6 processing, I grabbed it. From the looks of the bottle I would say it is from the 60s or 70s, but it was sealed until I opened it.
Now looking up online, it appears that to make a solution of SnCl2 it can be dissolved in 1M HCl. So I went ahead and made 100ml of a 1M HCl (ok, muriatic acid from Lowes) solution and tried dissolving 0.5 g SnCl2. Rather than dissolving a white precipitate seems to form: looks like a fine powder suspended in the liquid. And advice on getting the stuff to dissolve or is this normal? I have it heating a bit now but that doesn't appear to be helping.
Maybe the stuff is too old and no good anymore. IDK why they would have had the stuff. We're having a clean out event at work and guess they didn't know either so they tossed it.
It sounds like the stannous chloride has undergone hydrolysis. A way to prevent this is to have a few small pieces of tin metal in the bottle.
SnCl2 + H2O --> Sn(OH)Cl + HCl
When you opened the bottle was there an odor of hydrogen chloride?
No, there really wasn't any odor at all.
Well, if it's no good it isn't any great loss.