Potassium aurate

It is suggested that substances such as potassium cliloraurate are dissociated first by ammonia into simple halides, for the alkali clilor-aurates and bromaurates behave towards ammonia like the auric salts.2 Auric bromide, obtained by dissolving precipitated gold in bromine, also absorbs ammonia, the amount depending on the temperature. 

Auric hydroxide behaves as a very weak add having the anion AuOa. Evaporation of its solution in aqueous potassium hydroxide yields yellow needles of potassium aurate, KAu02,3H20.9 In accordance with the weak nature of the acid, the solution of this salt in water is strongly alkaline. 

Gold(III) hydroxide is made by the action of MgO on HA11CI4. Unlike Cu(OH)2 it dissolves in hot alkalis yellow crystals of potassium aurate, KAUO2.3H2O, can be recovered from such a solution. 

Derivation Action of hydrogen cyanide on potassium aurate. 

Gold is resistant to acids only aqua regia dissolves it when tetrachloro-aurate(III), [AuC ]", anions are formed. Gold dissolves slowly in potassium cyanide, when dicyanoaurate(I), [Au(CN)2] , anions are formed. From both the monovalent and trivalent forms gold can easily be reduced to the metal. Gold(I) compounds are less stable than those of gold(III). 

Auramine O Auramine hydrochloride Auramine Pure Auramine yellow. See Basic yellow 2 Aurantiol Aurantium. See Hydroxycitronellal methyl anthranilate Aurapel 366. See Silicone Aurate(l-), bis (cyano-C), potassium Aurate(l-), dicyano-, potassium. See Potassium gold cyanide... 

Synonyms potassium dicyanoaurate (I) potassium cyanoaurite gold (I) potassium cyanide potassium aurocyanide bis(cyano-C)-aurate(i-) potassium potassium cyanoaurate (I)... 

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