Why when copper sulphate crystals are placed in water some dissolved wwhile some settle?

Question

Why when copper sulphate crystals are placed in water some dissolved wwhile some settle?

Answer 1

before it gets saturated some will dissolve as the more dense crystals fall to the bottom, as you add the crystals to the water.

with a lot of mixing , more will dissolve.

once it is saturated, the excess crystals fall to the bottom