Question

Define hygroscopic, efflorescence, and deliquescence. [3 marks]

Answer 1

• A hygroscopic substance is a substance that absorbs moisture when exposed to air but does not form an aqueous solution. [1 mark]
• Efflorescence is the property by which some hydrated salts wholly or partially lose their water of crystallisation when exposed to dry air. [1 mark]
• A deliquescent substance absorbs excess moisture when exposed to air to form a saturated solution in water.
  [1 mark]