Chemical Reactions and Equations | Activity 1.5 with Solution

Activity 1.5

• Take about 2 g ferrous sulphate crystals in a dry boiling tube.
• Note the colour of the ferrous sulphate crystals. (Colour is green).
• Heat the boiling tube over the flame of a burner or spirit lamp as shown in Fig. 1.4.
• Observe the colour of the crystals after heating.

✅ Answer:

The green colour of ferrous sulphate (FeSO₄. 7H₂O) is changed to white due to the formation of anhydrous ferrous sulphate ((FeSO₄). i.e., water is lost. On further heating,  it becomes reddish-brown colour due to the decomposition of ferrous sulphate to ferric oxide (Fe₂O₃), sulphur dioxide (SO₂) and sulphur trioxide (SO₃) with a characteristic odour of burning sulphur.

• Activity 1.1
• Activity 1.2
• Activity 1.3
• Activity 1.4
• Activity 1.5
• Activity 1.6
• Activity 1.7
• Activity 1.8
• Activity 1.9
• Activity 1.10
• Activity 1.11

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