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
This is a red colored crystalline solid which is soluble in water and decomposes on heating to give gold (I) chloride and Cl2
It dissolves in concentratedHCl forming chloroauric acid
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]
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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