Which device would protect hygroscopic substances from humidity during storage?

• A. Beaker
• B. Pipette
• C. Desiccator
• D. Amber bottle container

Answer: (C)

Hygroscopic substances absorb moisture from the air, so keeping them dry during storage requires a sealed environment that actively removes water vapor. A desiccator does exactly this: it’s a sealed chamber that contains a desiccant such as silica gel or calcium chloride, which pulls moisture out of the air inside. A perforated shelf keeps the items above the desiccant so they stay dry while the desiccant maintains a low humidity overall. This setup protects moisture-sensitive materials from clumping, hydrolysis, or other reactions caused by ambient humidity.

Beaker is open to the surroundings and does not prevent humidity from affecting the contents. A pipette is a measuring tool, not a storage container, so it doesn’t protect against humidity. An amber bottle blocks light but does not inherently control moisture unless used with a desiccant or sealing method.