The compounds of gold
(1) Auric chloride, AuCl3 : It can prepared by passing dry Cl2 over finely divided gold powder at the temperature of 573 K
![2171_compounds of gold.png](https://www.expertsmind.com/../CMSImages/2171_compounds of gold.png)
This is a red colored crystalline solid which is soluble in water and decomposes on heating to give gold (I) chloride and Cl2
![427_compounds of gold1.png](https://www.expertsmind.com/../CMSImages/427_compounds of gold1.png)
It dissolves in concentratedHCl forming chloroauric acid
![901_compounds of gold2.png](https://www.expertsmind.com/../CMSImages/901_compounds of gold2.png)
Chloroauric acid is used in the photography for toning silver prints and as an antidote for the snake poisoning.
(2) Aurous sulphide, Au2S : It is prepared when H2S is passed through an acidified solution of potassium aurocyanide, K[Au(CN)2]
![1905_compounds of gold3.png](https://www.expertsmind.com/CMSImages/1905_compounds%20of%20gold3.png)
It is a dark brown solid, not attached by the dilute mineral acids and therefore is probably the most stable gold compound.
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