Science dogma

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Golden rain experiment or golden spangle experiment

It is a spectacular science experiment. When a hot solution of lead iodide cools down, the salt settles in beautiful golden spangle.

Reagents and equipment


  • Lead nitrate or any other lead salt (0.3 g)
  • Potassium iodide (0.3 g)
  • Acetic acid (0.2 ml)
  • Distilled water (500 ml)
  • Two beakers
  • Flask (500 ml)

Procedure

  1. Pour lead nitrate solution into a flask.
  2. Then add potassium iodide. As a result lead (II) iodide form.
  3. Add hot water until the precipitate dissolves.
  4. Cool the flask. then lead iodide precipitate forming shining golden crystal.

Process

When the solutions of two salts are mixed, an exchange reaction takes place
Pb(NO3)2 + 2KI →PbI2↓ + 2KNO3
Lead iodide is insoluble in cold water, but at high temperature its solubility increases. So in hot solution the precipitation cannot observe. When the mixture cool, the solubility of lead iodide decreases, and PbI2 crystal gradually begin to settle



4 comments:

  1. UnknownJanuary 29, 2019 at 1:21 AM

    Good job.

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    1. UnknownJanuary 29, 2019 at 2:19 AM

      Thanks for your valuable feedback, if you like our content please share in your circle. Keep supporting

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  2. UnknownJanuary 29, 2019 at 1:52 AM

    Intresting

    ReplyDelete
    Replies
    1. UnknownJanuary 29, 2019 at 2:20 AM

      Thanks for your valuable feedback and keep supporting

      Delete

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