Abstract
Anhydrous hydrogen chloride, which is far more reactive than concentrated aqueous hydrochloric acid, is formed when solid zinc chloride or evaporation residues of its solutions are heated. Certain reactions, which cannot be accomplished with the concentrated aqueous acid, can be realized by fusion with zinc chloride. Detection of calcium, magnesium, ferrous iron, nickel, and potassium in silicates; differentiation of niobium and tantalum pentoxides, can be based on the ready decomposition of silicates and on a redox reaction of niobium pentoxide. Fusion with zinc chloride can release ferrous iron from acid-resistant minerals that contain no silica. All of these processes can be accomplished with slight amounts of sample and within the technique of spot test analysis.
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