3.4.2

Reactions of Halogens

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Identification of Halides

We can determine which halide ion is present through specific reactions.

Reaction with silver nitrate

Reaction with silver nitrate

  • If we add silver nitrate to a solution of halide ions, the halides will react with the silver cations:
    • Ag+(aq) + X(aq) → AgX(s)
Test results

Test results

  • The product of the silver nitrate reaction is a solid.
    • We call this solid the precipitate.
  • The colour of this solid depends on what halide is involved:
    • AgCl → white precipitate.
    • AgBr → cream precipitate.
    • AgI → yellow precipitate.
Further testing

Further testing

  • Using the silver halide product, we can test that their ability to redissolve in ammonia is as expected.
    • AgCl should redissolve.
    • AgBr should redissolve slowly and needs a lot of ammonia.
    • AgI should NOT dissolve.
Jump to other topics
1

Structure - Models of the Particulate of Matter

2

Structure - Models of Bonding & Structure

3

Structure - Classification of Matter

3.1

The Periodic Table: Classification of Elements

3.2

Periodic Trends

3.3

Group 1 Alkali Metals

3.4

Halogens

3.5

Noble gases, group 18

3.6

Functional Groups: Classification of Organic

3.7

Functional Group Chemistry

3.8

Alkanes

3.9

Alcohols

3.10

Halogenoalkanes

4

Reactivity - What Drives Chemical Reaction?

5

Reactivity - How Much, How Fast & How Far?

6

Reactivity - The Mechanisms of Chemical Change

7

Measurement, Data Processing & Analysis

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