An Elementary Treatise On Qualitative Chemical Analysis
An Elementary Treatise On Qualitative Chemical Analysis
James Freeman Sellers
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The precipitation does not occur in the cold, like that from phosphoric acid (which see). (NH 4 ) 2 MoO 4 in HNO 3 solution changes to the more com- plex salt (NII 4 ) a Mo 4 O 13, which, with H 3 AsO 4, forms insoluble (MoO 3 ) 12 -(NH 4 ) 3 AsO 4 . The reagent should be added in large excess (about 4 : 1), as the precipitate is soluble in H 3 AsO 4 . 5. Similar to 4, under arsenious compounds. 6. Similar to 5, under arsenious compounds. Antimony (salt for study, antimonious chloride, SbCl 3 ).... 1. I^S precipitates orange antimonious sulphide, Sb 2 S 3, soluble in (NH 4 ) 2 S X, hot concentrated HC1, and aqua regia; insoluble in (NH 4 ) 2 CO 3 . 2. NH 4 OH and NaOH precipitate white antimonious hydroxide, Sb(OH) 3, soluble in excess of NaOH. 3. AgN0 3 precipitates from alkaline solutions of anti- monious salts a black mixture of Ag 2 O and metallic 92 CHEMICAL ANALYSIS silver. From antimonic salts, AgNO 3 precipitates white silver antimonate, Ag 3 SbO 4, soluble in NH 4 OH. These reactions are useful for detecting the -ous and the -ic conditions of antimony.
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