Alkali Metals React with Chlorine

  1. All alkali metals react with chlorine gas to form white metal chlorides salt.

    1. Group 1 Metals + Chlorine Gas → Metal Chloride
  2. The metal chlorides salt formed is soluble in water to give a neutral solution of pH 7.
  3. The reactivity increases down the group from lithium, sodium to potassium.
Example:

Lithium + Chlorine


2Li + Cl2 → 2LiCl

Observation
Lithium burned slowly with a reddish flame . A white solid is produced.


Sodium + Chlorine


2Na + Cl2 → 2NaCl

Observation
Sodium burned brightly with a yellowish flame. A white solid is produced.


Potassium + Chlorine


2K + Cl2 → 2KCl

Observation
Potassium burned very brightly with a purplish flame . A white solid is produced.

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