F.5 Chem

Sodium hydroxide solid (NaOH) can absorb water in air. Therefore, sodium hydroxide can be used as a drying agent.

Besides, sodium hydroxide would then change to an aqueous solution by dissolving itself in the water absorbed. This property is known as "deliquescence" (潮解).

2008-04-06 14:56:20 補充：
Sodium hydroxide can absorb both carbon dioxide and water in air.

No, NaOH only absorbs CO2 in air.
NaOH + CO2 --> NaHCO3