BRAINCAKEHalogen-Halide Displacement Reactions
A more reactive halogen will displace a less reactive halide from a solution of its salt. The solution changes colour
Solutions of bromine and iodine in water can appear similar in colour as they are both brown. A non-polar reagent such as cyclohexane can be added. Halogens dissolve more readily in cyclohexane than water and the colours are easier to tell apart. Chlorine is pale green in cyclohexane, bromine is orange and iodine is violet.
The three reactions are:
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Key terms in this lesson
- Salt
- A compound formed when the hydrogen ions in an acid are replaced by metal ions or ammonium ions.
More in Reactivity Trends
- Solubility of Group 2 Hydroxides
- Uses of Group 2 Compounds
- Group 7 Halogens Trends in Boiling Points
- Group 7 Redox Reactions and Reactivity
- Halogen Disproportionation Reactions
- Uses of Halogens
- Test for Halide Ions
- Test for Anions
All 16 lessons in Reactivity Trends · All OCR AS-level Chemistry topics