Class 12 Chemistry Surface Chemistry Charge on Colloids

Charge on Colloids-

Colloidal particles always have an electric charge. The nature of this charge is the same on all the particles in a given colloidal solution and maybe either +ve  or –ve.

Positively charged sols-

  • Haemoglobin
  • Oxides-TiO2 solution
  • Hydrated Metal oxides like Al2O3.xH2O , Fe2O3.xH2O
  • Dyes-methylene blue sols

Negatively charged sols-

  • Metals- Cu, Ag, Au sols
  • Metallic sulphides-As2S3, CdS
  • Acid dye stuffs- Eosin
  • Sols of starch, gelatin

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