When you mix water and calcium chloride, the resulting solution is colorless.

Here's why:

* Calcium chloride (CaCl2) is a white solid.

* Water (H2O) is a clear liquid.

When these two substances are mixed, the calcium chloride dissolves in the water, creating a solution. The resulting solution is transparent and colorless.

It's important to note that while the solution itself is colorless, calcium chloride can be hygroscopic (meaning it attracts and absorbs moisture from the air). If the calcium chloride is exposed to air for a long time, it might develop a slightly cloudy appearance due to the absorbed moisture.