… dark violet powder. Auric oxide (Au 2 O 3 ) (auric anhydride) is a brown powder; the corresponding acid is auric … of gold and sodium (NaAu(SO 3 )) and of gold and ammonium (NH 4 Au(SO 3 )) marketed as colourless solutions, are used …
… Explanatory Note to sub‑Chapter I) or of the ammonium ion (NH 4 + ) fall in sub‑Chapter V except in the case of … in organic synthesis and also in the manufacture of acetic anhydride or chlorosulphonic acid. (5) Carbonyl dichloride …
