Explain preparation of sulphur sol and gold sol.

Asked by Topperlearning User | 21st Jun, 2016, 03:59: PM

Expert Answer:

Sulphur sol and gold sol are Lyophobic sols and are unstable and are build to colloidal size from small particles by the Condensation method by Chemical reactions.
 
 Oxidation sulphur sol is prepared by passing H2S into SO2
  1.  H2S + SO2 → S (sol) + H2O 

  2. Reduction of AuCl3 with formaldehyde gives gold sol.
    AuCl3+ HCHO + 3H2O → Au (sol) + 3HCOOH + 6HCl

Answered by  | 21st Jun, 2016, 05:59: PM