Question

Define the following term:

(c) Efflorescence

Answer 1

Definition

• When some hydrates are exposed to the atmosphere, they lose their water of crystallization partially or completely, resulting in the formation of a powder. Such substances are called efflorescent substances .
• The phenomenon is known as Efflorescence.

Examples

• Sodium carbonate $\left({\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}\right)$ and sodium sulfate $({\mathrm{Na}}_2{\mathrm{SO}}_4.10{\mathrm{H}}_2\mathrm{O})$.