Students should be able to see that the solid lead iodide forms closer to the lead nitrate crystal. This is because the iodide ions are smaller than the lead particles and so move faster.
Equipment required (per set)
The formula for this reaction is below:
Pb(NO3)2 + 2KI 2KNO3 + PbI2
Lead nitrate is toxic ? use forceps when handling the crystals.
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