Stannous Chloride

Discussion in 'Silver Gelatin Based Emulsion Making & Coating' started by kb3lms, Nov 27, 2012.

  1. kb3lms

    kb3lms Subscriber

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    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.

    -- Jason
     
  2. Gerald C Koch

    Gerald C Koch Member

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    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?
     
    Last edited by a moderator: Nov 27, 2012
  3. kb3lms

    kb3lms Subscriber

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    No, there really wasn't any odor at all.

    Well, if it's no good it isn't any great loss.