Is Lead Iodide Precipitate Stable Over Time?

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Discussion Overview

The discussion centers on the stability of Lead Iodide precipitate over time, particularly in a water solution containing Potassium Iodide and Lead Nitrate. Participants explore the potential degradation of the precipitate and the stability of associated compounds under varying temperature conditions.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the long-term stability of Lead Iodide precipitate stored in water at room temperature, questioning whether it would degrade or produce gas.
  • Another participant suggests that Lead Iodide likely remains stable over time, indicating that it has few decomposition products.
  • A follow-up question is posed regarding the stability of solid Potassium Iodide in relation to the stability of Lead Iodide.
  • A participant confirms that many inorganic salts, including Lead Iodide, are generally stable over long periods, although some unstable salts are known.

Areas of Agreement / Disagreement

Participants appear to agree that Lead Iodide is likely stable over time, but there is no consensus on the stability of Potassium Iodide, as it was only briefly addressed.

Contextual Notes

The discussion does not address specific conditions under which Lead Iodide might degrade, nor does it clarify the implications of the presence of Potassium Nitrate in the solution.

Who May Find This Useful

This discussion may be of interest to those studying inorganic chemistry, particularly in the context of precipitate stability and the behavior of salts in solution.

Kushal
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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
 
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Not many things it could decompose into, so I bet it is still there.
 
Thank you! Do you think that would apply to Potassium Iodide solid too?
 
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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