Interstitial water molecules are present in
CrCl3.6H2O
BaCl2.2H2O
CuSO4.5H2O
MgSO4.7H2O
CrCl3.6H2O.....CrH2O6Cl3....coordinated water CuSO4.5H2O.....CuH2O4 SO4.H2O...coordinated and hydrogen bonded water MgSO4.7H2O.....MgH2O6 SO4.H2O....coordinated and hydrogen bonded water BaCl2.2H2O....interstitial water