摘要：Inwater, metal ions becomehydratedby formingco-ordinate bondswith H2OH2O ligands. Themetal-aqua ionsof aluminium, copper, iron(II)

In water, metal ions become hydrated by forming co-ordinate bonds with H2OH2O ligands. The metal-aqua ions of aluminium, copper, iron(II) and iron(III) form coloured precipitates when they undergo different reactions. These precipitates are used to identify the metal-aqua ion that is present in a solution.

来源：安娜说留学