Typical examples occur in the Keggin structure of the phosphomolybdate ion.
2.
If the solution turns a dark red, that indicates the phosphomolybdate complex ion has formed.
3.
Historically, one of the first successful catalysts was bismuth phosphomolybdate supported on silica as a heterogeneous catalyst.
4.
Next in recycling feasibility would be sizeable catalysts with a fair bismuth content, perhaps as bismuth phosphomolybdate, and then bismuth used in galvanizing and as a free-machining metallurgical additive.
5.
When being used as an indicator, a color change is involved in order to indicate a change in the pH . For example, in a solution containing inorganic phosphate and ammonium molybdate in sulfuric acid, a reaction could occur where the two substances react forming a phosphomolybdate complex ion, or no reaction could occur.
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