Homework The Halogens

The Halogens

Please make sure that all your observations for the reaction with iron wool and with the solutions; KI_(aq), KBr_(aq) and KCl_(aq) are recorded. Please write equations for the reactions and explain the trend in reactivity.

E.g. Cl₂ + 2I^- →  I₂ +  2Cl^-

Or showing the two half equations:  Cl₂ + 2e^- → 2Cl^-    (reduction)

                                                                  2I^- → I₂ + 2e^-        (oxidation)

This illustrates that chlorine can oxidise iodide ions and that chlorine is more reactive than iodine.