- All alkali metals react with chlorine gas to form white metal chlorides salt.
- The metal chlorides salt formed is soluble in water to give a neutral solution of pH 7.
- The reactivity increases down the group from lithium, sodium to potassium.
Group 1 Metals + Chlorine Gas → Metal Chloride
Lithium + Chlorine
2Li + Cl2 → 2LiCl
Lithium burned slowly with a reddish flame . A white solid is produced.
Sodium + Chlorine
2Na + Cl2 → 2NaCl
Sodium burned brightly with a yellowish flame. A white solid is produced.
Potassium + Chlorine
2K + Cl2 → 2KCl
Potassium burned very brightly with a purplish flame . A white solid is produced.