In lab desiccators, common desiccants include silica gel, activated alumina, calcium sulfate (Drierite), and molecular sieves.

 In lab desiccators, common desiccants include silica gel, activated alumina, calcium sulfate (Drierite), and molecular sieves. These materials absorb moisture, creating a dry environment inside the desiccator to protect samples from humidity. 

Brief Overview of Common Desiccants:

Silica Gel:

A porous, inert, and non-toxic material that effectively absorbs water vapor. It is often used in gel form, such as in desiccant pouches. 

Activated Alumina:

Another porous material that can absorb moisture. It is often used in the form of granules or beads. 

Calcium Sulfate (Drierite):

A hygroscopic solid that absorbs moisture, changing color when saturated. It is commonly used in desiccators and in-line air and gas drying columns. 

Molecular Sieves (Zeolites):

These have a highly porous structure and can effectively absorb water vapor. They can be more effective than silica gel at removing moisture.