Hygroscopy

Hygroscopy

Certain substances, when exposed to the atmospheric air at ordinary temperature, absorb moisture without changing their physical state. Such substances are called hygroscopic substances and this property is called hygroscopy.

Hygroscopic substances are used as drying agents.

Example: 1. Conc.Sulphuric acid (H₂SO₄).

2. Phosphorus Pentoxide (P₂O₅).

3. Quick lime (CaO).

4. Silica gel (SiO₂).

5. Anhydrous calcium chloride (CaCl₂).