Purple of cassius:
Purple of cassius is only a kind of colloidal gold. It is purple or red in color and after the name of Cassius who introduced it.
Preparation:
It is made by mixing very dilute solution of gold chloride along with stannous chloride solution.
2AuCl3 + 3 SnCl2 → 2Au↓ + 3SnCl4
The gold so precipitated is absorbed by stannic hydroxide made by the hydrolysis of SnCl4.
SnCl4 + 4H2O→ Sn(OH)4 + 4HCl
Uses:
It is utilized in making ruby-red glass and high class pottery.
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