Why orthophosphoric acid mixture used in iron volumetric analysis?
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A polyprotic acid has more than one hydrogen ion that it can donate to a solution. As the hydrogen ion donation increases, a solution's pH lowers; it becomes more acidic. For example, the chemical formula for sulfuric acid is H2SO4. It is diprotic; it has two hydrogen ions it can donate to a solution. The chemical formula for phosphoric acid is H3PO4. It is triprotic; it has three hydrogen ions it can donate to a solution. However, this does not determine whether those hydrogen ions will all dissociate in a solution. Instead, you must consider the acid-dissociation equilibrium constant.
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