The Production Process of Sodium tetrachloroaurate

The production process of sodium tetrachloroaurate involves several steps, which are outlined below:

1. Preparation of the Gold Solution: The first step in the production of sodium tetrachloroaurate is the preparation of a gold solution.
   This is done by dissolving gold(III) chloride in a solution of sodium hydroxide.
   The gold(III) chloride is added to the sodium hydroxide solution, and the resulting mixture is stirred until the gold(III) chloride is fully dissolved.
   
2. Addition of Hydrochloric Acid: Once the gold(III) chloride is fully dissolved, a solution of hydrochloric acid is added to the mixture.
   This causes the formation of a white precipitate, which is collected and washed with water to remove any impurities.
   
3. Calcination of the Precipitate: The white precipitate obtained in the previous step is then dried and heated in a furnace at a high temperature.
   This process, known as calcination, removes any remaining impurities and results in the formation of pure sodium tetrachloroaurate.
   
4. Hydrolysis of Sodium Tetrachloroaurate: The final step in the production of sodium tetrachloroaurate is the hydrolysis of the sodium tetrachloroaurate precipitate.
   This is done by treating the precipitate with water, which results in the formation of a solution of sodium tetrachloroaurate.
   
5. Purification of the Solution: The sodium tetrachloroaurate solution obtained in the previous step is then purified by passing it through a column packed with activated carbon.
   This removes any impurities that may be present in the solution.
   
6. Crystallization of Sodium Tetrachloroaurate: Once the sodium tetrachloroaurate solution has been purified, it is allowed to cool and the crystals that form are collected and washed with water to remove any impurities.
   
7. Recrystallization of the Crystals: The sodium tetrachloroaurate crystals obtained in the previous step are then dissolved in a suitable solvent and recrystallized to produce pure sodium tetrachloroaurate.
   

Overall, the production process of sodium tetrachloroaurate involves several steps, including the preparation of a gold solution, the addition of hydrochloric acid, calcination of the precipitate, hydrolysis of sodium tetrachloroaurate, purification of the solution, crystallization of sodium tetrachloroaurate, and recrystallization of the crystals.
This process requires careful attention to detail and the use of specialized equipment to ensure the production of pure sodium tetrachloroaurate.