what will happen to the mass of the content of the evaporating dish as it cools an how could this be prevented

Question

A student allows the evaporating dish and the anhydrous salt for a long time on the lab bench. what will happen to the mass of the content of the evaporating dish as it cools and how could this be prevented

Answer 1

It will initially decrease and then will fluctuate as the environment gains or loses moisture and the salt/solution equilibriates.

To prevent this it should be stored in a dry and controlled place.

Answer 2

I'm not exactly sure, but I think that after some time, it would evaporate, and there's no known way to stop it from evaporating