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Nitratoauric acid, hydrogen tetranitratoaurate, or simply called gold(III) nitrate is a crystalline gold compound that forms the trihydrate, HAu(NO 3) 4 ·3H 2 O or more correctly H 5 O 2 Au(NO 3) 4 ·H 2 O. [3] [2] This compound is an intermediate in the process of extracting gold. [4] In older literature it is also known as aurinitric acid. [5]
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Gold pentafluoride, along with its derivative anion, AuF − 6, and its difluorine complex, gold heptafluoride, is the sole example of gold(V), the highest verified oxidation state. [ 19 ] Some gold compounds exhibit aurophilic bonding , which describes the tendency of gold ions to interact at distances that are too long to be a conventional Au ...
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In 1783, Carl Wilhelm Scheele discovered that gold dissolved in aqueous solutions of cyanide. Through the work of Bagration (1844), Elsner (1846), and Faraday (1847), it was determined that each gold atom required two cyanide ions, i.e. the stoichiometry of the soluble compound.
Chloroauric acid is the product formed when gold dissolves in aqua regia. [15] On contact with water, AuCl 3 forms acidic hydrates and the conjugate base [AuCl 3 (OH)] −. A Fe 2+ ion may reduce it, causing elemental gold to be precipitated from the solution. [1] [16] Other chloride sources, such as KCl, also convert AuCl 3 into [AuCl 4] −.
The solution needs to be near neutral, because silver hydroxide forms at high pH, while the chromate forms Ag 2 Cr 2 O 7 or AgHCrO4 at low pH, reducing the concentration of chromate ions, and delaying the formation of the precipitate. Carbonates and phosphates precipitate with silver, and need to be absent to prevent inaccurate results.
Gadolinium(III) nitrate is an inorganic compound of gadolinium. This salt is used as a water-soluble neutron poison in nuclear reactors. [1] Gadolinium nitrate, like all nitrate salts, is an oxidizing agent. The most common form of this substance is hexahydrate Gd(NO 3) 3 •6H 2 O with molecular weight 451.36 g/mol and CAS Number: 19598-90-4.