S128: Chemical Rxns – Synthesis – 2Al(s) + 3I2(s) → 2AlI3(s)

Introduction

Aluminum dust added to finely ground I₂ produces heat and copious purple vapor upon the addition of water.

2Al(s) + 3I₂(s) →2AlI₃(s) + ∆

 To Conduct Demonstration

1. Place evaporating dish on a ventilation grate on the bench.
2. Place finely ground iodine crystals and aluminum dust in the evaporating dish and mix with a stirring rod.
3. Carefully add a few drops of water from a wash bottle.  CAUTION: Do not breathe any of the fumes!

Demo Time: ~5 minute

Safety 

Intense heat and vapors are produced in the demonstration.  Perform only with adequate ventilation.  Handle hot glassware with care.  Do not breathe aluminum dust.

Acknowledgment

Steven Zumdahl, Fall 1990
Lora Ruffin and Michael Polk, Summer 2009