Chlorine, bromine, and iodine are separately dissolved in water to make aqueous solutions. Potassium bromide solution is added to a sample of each of these solutions.
Table 1 shows the observations.
Table 1
| Halogen dissolved in water | Initial colour of aqueous solution | Final colour of mixture |
|---|---|---|
| Chlorine | Pale green | Orange |
| Bromine | Orange | Orange |
| Iodine | Brown | Brown |
Explain the observations shown in the table.
106 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.