Anhydrous calcium chloride turns into a colourless solution when exposed to air.
Deliquescence is the process by which a chemical substance absorbs and dissolves moisture from the air. As a result, deliquescent substances absorb moisture from the air. Calcium chloride is a liquefiable material. When anhydrous calcium chloride is exposed to air, it absorbs enough water from the atmosphere to dissolve. Instead of a white lump, you'll have a pool of clear liquid after a short time. Final answer Anhydrous calcium chloride is a deliquescent, which is why when exposed to air it turns colourless.
