Ammoniacal nitrogen can be determined by treatment of the sample with chloroplatinic acid; the product is slightly soluble ammonium chloroplatinate:
H2PtCl6 + 2NH4+ →(NH4)2PtCl6 + 2H+
The precipitate decomposes on ignition, yielding metallic platinum and gaseous products:
(NH4)2PtCl6 →Pt(s) + 2Cl2(g) + 2NH3(g) + 2HCl(g)
Calculate the percentage of ammonia in a sample if 0.2115 g gave rise to 0.4693 g of platinum.
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