Question

Give an example of a hygroscopic substance.

Answer 1

Hygroscopic substances:

• The absorption and adsorption of water from the surrounding environment by the matter is called hygroscopy.
• The substances which cause the hygroscopic effect are called hygroscopic substances.
• Heating can remove absorbed water.
• Examples of hygroscopic compounds are sodium chloride $\left(\mathrm{NaCl}\right)$, calcium chloride $\left({\mathrm{CaCl}}_2\right)$, zinc chloride $\left({\mathrm{ZnCl}}_2\right)$, calcium oxide $\left(\mathrm{CaO}\right)$ - commonly called quick lime.