Lead iodide in a Petri dish

Two solid salts are put in the opposite sides of the Petri dish, and a yellow front arises in the solution

Scientific name: Due to the diffusion of lead cations and iodide anions in the liquid, yellow precipitate of lead iodide is formed when ions react

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Safety

Wear eye protection Lead nitrate and potassium iodide are toxic. Avoid contact of lead nitrate with the skin.

Always follow general safety recommendations. Please note that conducting chemistry experiments you must comply with the relevant legal procedures in your country.

Reaction formula

Pb(NO3)2 + KI → PbI2

Step-by-step instruction

  1. Fill a Petri dish with water.
  2. Accurately place some crystals of lead nitrate at one side of this dish.
  3. Accurately place some crystals of potassium iodide at the other side of the Petri dish.
  4. The yellow streak will appears near the center of the Petri dish.

Scientific background

When lead nitrate and potassium iodide dissolve in water, ions produced by them diffuse in the liquid. Yellow precipitate of lead iodide is formed, when lead cations and iodide anions meet together.

Danger:
Coolness:
Difficulty:

Published on 10 March 2015

  • Fire
  • Heating with fire
  • Explosion
  • Poisoned gas
  • Organic
  • Electricity
  • Solution
  • Oxidation reduction
  • Color change
  • Precipitate
  • Gassing
  • Catalyst