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ICSE Class 9 Chemistry Question 2 of 31

Water — Question 16

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Question 16

Differentiate between hydrated and anhydrous crystals with examples. State three defined changes which occur when hydrated copper sulphate is heated.

Answer
Hydrated CrystalsAnhydrous Substance
Hydrated Crystals contain fixed number of water molecules [as water of crystallization] in loose chemical combination with the substance e.g., CuSO4.5H2OAnhydrous Substance does not contain any fixed number of molecules [as water of crystallization] in loose chemical combination with the substance e.g., KNO3

Changes that occur when hydrated copper sulphate is heated are :

  1. White powder of anhydrous copper sulphate is formed from blue crystals of hydrated copper sulphate.
  2. No geometric shape is seen.
  3. Anhydrous copper sulphate is amorphous in nature.