When something is soluble in water hydration forms around it, what is it called?

Well its either an compound or molecule cuz both breaks apart to form ions.

hope this helps.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.