Chemistry (AS Level)·Group 17 · NSSCAS 3.4.3–3.4.5
Reactions & Uses of the Halides
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How do we test for a halide, and what happens when chlorine meets sodium hydroxide? Learn the reactions of halide ions with silver nitrate and ammonia and with concentrated sulfuric acid, the disproportionation of chlorine in cold and hot alkali, the effect of pH, and the vital uses of chlorine in water treatment and bleach — including in Namibia.
What you'll learn in this lesson
By the end you should be able to (NSSCAS Chemistry (AS Level) 3.4.3–3.4.5):
- Describe and explain the reactions of halide ions with aqueous silver ions followed by aqueous ammonia
- Describe and explain the reactions of halide ions with concentrated sulfuric acid
- Describe, in terms of oxidation number, the disproportionation of chlorine with cold and hot aqueous NaOH
- Describe the effect of pH changes on the equilibrium of chlorine with sodium hydroxide
- Explain the use of chlorine in water treatment and the importance of the halogens and their compounds
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