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Stability of Lead Iodide

  1. May 21, 2013 #1
    About 6 years ago, I made a precipitate of Lead Iodide in water by mixing Potassium Iodide and Lead Nitrate.

    I have kept the precipitate in a test tube.

    Would anybody know how stable is the precipitate over time. The temperature has been mostly between 20 and 32 degrees depending on the season (room temperature). Would the precipitate degrade or would any gas form? There is also Potassium Nitrate in solution. Would this degrade as well?

    The test tube is almost full of water, and I would think that there is no more than 2 g of lead iodide precipitate in it.

    Thank You
     
  2. jcsd
  3. May 21, 2013 #2

    Borek

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    Staff: Mentor

    Not many things it could decompose into, so I bet it is still there.
     
  4. May 21, 2013 #3
    Thank you! Do you think that would apply to Potassium Iodide solid too?
     
  5. May 21, 2013 #4

    Borek

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    Staff: Mentor

    Yes.

    Many inorganic salts are stable no matter how long you store them. Not all, but the unstable ones are usually well known.
     
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