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Chem Chemistry

ChemistryNEB 2074 (old course)

Differentiate between hygroscopic and deliquescent substances giving an example of each.

2

Answer

· Based on the official syllabus and past papers
Updated 
| **Feature**               | **Hygroscopic Substances**                          | **Deliquescent Substances**                          |
|---------------------------|----------------------------------------------------|----------------------------------------------------|
| **Definition**            | Substances that absorb moisture from the air but do not dissolve in it. | Substances that absorb moisture from the air and dissolve in it to form a solution. |
| **State after absorption**| Remain in solid or liquid state without forming a solution. | Form a liquid solution by dissolving in absorbed water. |
| **Example**               | Calcium chloride (CaCl₂, anhydrous) absorbs moisture but does not dissolve in it. | Sodium hydroxide (NaOH) absorbs moisture and dissolves to form a solution. |

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