Which statement best describes the water molecules in a hydrate? they slide around the ions throughout the crystal lattice. they vibrate but are held in fixed positions in the crystal lattice. they have no motion because they are held in fixed positions in the crystal lattice. they vibrate randomly along the outer edges of the crystal lattice.

The statement best describes the water molecules in a hydrate: They have no motion because they are held in fixed positions in the crystal lattice.
A hydrate is a compound that absorbs water molecules from its environment and includes them as part of its structure. The water molecules either remain intact inside the compound or partially break up into their elements.