Chromium ions, identification reactions

Identification of chromium after oxidation to chromate. Having carried out the oxidation with one of the methods described under reaction 7, chromate ions may be identified with one of the following tests ... 

Flame tests are not commonly used to identify transition metals. The presence of a certain transition-metal ion in a solution is sometimes obvious from the solution s color. Some transition-metal ions can be more accurately identified using a procedure called qualitative analysis. Qualitative analysis is the identification of ions by their characteristic reactions. The transition-metal ions most often identified through qualitative analysis include copper, nickel, zinc, chromium, iron cobalt, cadmium, manganese, and tin. Most tests to identify the presence of an ion in a mixture involve causing the ion to precipitate out of solution. Some of the more dramatic precipitation reactions for transition metals are shown. 

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