A21 Chlorine Displacement of Halide Salts

Description
Chlorine passes through a tube which contains moist potassium bromide at one point and potassium iodide further down the tube. Bromine and Iodine are clearly present in the tube after reaction. Some yellow crystals also form.

Equation
Cl₂ + 2 KBr --> Br₂ + 2 KCl

Br₂ + 2 KI --> I₂ + 2 KBr

I₂ + 3 Cl₂ --> I₂Cl₆ (yellow crystals)

Reference
H. N. Alyea and F. B. Dutton, Eds.,"Tested Demonstrations in Chemistry", 6th ed., Journal of Chemical Education, Easton, Pennsylvania (1965) p.44.