Cambridge IGCSE Chemistry · Syllabus 0620 · Acids, Bases and Salts
Hydrated Substance
What is Hydrated Substance?
A substance that is chemically combined with water. Hydrated copper(II) sulfate is blue and hydrated cobalt(II) chloride is pink; heating either one drives the water off and leaves the anhydrous substance, which is a different substance with a different colour.
This definition is part of the Acids, Bases and Salts chapter in Cambridge IGCSE Chemistry.