The Hydrated Magnesium Ion Deaquation in Zinc Potassium Sulphate Hexahydrate

The interatomic distances and angles are listed in Tables-2.1 and 2.2. All water molecules are coordinated to magnesium ions, six to each one. The crystal structure (Fig. 2.2) consists of a packing of these octahedrally hydrated magnesium ions and unhydrated ammoniums, among the tetrahedral sulphate ions. From the tables it follows that the water octahedra are not regular with their four equatorial bonds being almost equal but greater than the two nearly equal axial (polar) bonds.