A metal ion in aqueous solution or aqua ion is a cation dissolved in water of chemical formula mh 2 o n z the solvation number n determined by a variety of experimental methods is 4 for li and be 2 and 6 for elements in periods 3 and 4 of the periodic table lanthanide and actinide aqua ions have a solvation number of 8 or 9. We often write transition metal ions in aqueous solution with symbols such as cr 3 cu 2 and fe 3 as though they were monatomic but this is far from being the case these ions are actually hydrated in solution and can be regarded as complex ions. The transition metals form colored ions complexes and compounds in aqueous solution the characteristic colors are helpful when performing a qualitative analysis to identify the composition of a sample the colors also reflect interesting chemistry that occurs in transition metals. A metal ion in aqueous solution is a cation dissolved in water of chemical formula mh2onz the solvation number n determined by a variety of experimental methods is 4 for li and be2 and 6 for elements in rows 3 and 4 of the periodic. Reactions of metal ions in aqueous solution chemistry a level 7405 this resource v14 represents colours of solutions and products specification reference 326 reactions of ions in aqueous solution students are expected to describe metal aqueous ion action of naoh action of an excess of naohaq 3 action of nh 3 aq action of an excess
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