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WEEK 5
TOPIC: HALOGENS
CONTENT:
- Preparation of chlorine (laboratory and industrial)
- Properties of chlorine (physical and chemical)
- Hydrogen chloride gas: laboratory preparation properties and uses,
- Test for HCl gas and fountain experiment.
PERIOD 1: PREPARATION OF CHLORINE (LABORATORY AND INDUSTRIAL)
In the laboratory chlorine is prepared by the oxidation of concentrated hydrochloric acid with manganese (IV) oxide. The mixture is heated to obtain a greenish- yellow gas (chlorine).
MnO2(s) + 4HCl (aq) → MnCl2(aq) + 2H2O + Cl2
Chlorine is prepared industrial by the electrolysis of brine and molten metallic chlorides
PERIOD 2: PHYSICAL PROPERTIES OF CHLORINE
- It is a greenish-yellow gas with an unpleasant choking smell.
- It is denser than air.
- It is slightly soluble in water.
- It is poisonous.
The chemical properties of chlorine have been discussed under the general properties of halogens. Let’s discuss the oxidizing properties of chlorine.
- Chlorine oxidizes hydrogen sulphide to yellow sulphur.
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