on 25th October, 2010
Anonymous
 
 
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how can the tyndall effect be used to distinguish between a colloid and a solution?

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on 21st July, 2011
George Taylor
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It is more accurately called Faraday Tyndall effects. This happens when light passes by way of a colloidal dispersion and it is scattered through the colloidal particles causing visible cones. Coarse dispersion i.e suspension and emulsion are usually white due to the scattering of the light. It is dependent on the actual refractive index of the dispersed and also continous phase. Hydrophilic colloids are hydrated so minimum tyndall result can be observed. Hydrophobic colloids, however, Tyndall effect can be easily observed. Learn more Tyndall Effect
 
 

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on 9th November, 2010
Anonymous
 
 
 
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When a strong beam of light is passed through a colloidal solution, the path of the light becomes visible when viewed from a direction at right angle to that of the incident light. This occurs because the colloidal particles absorb light energy and then scatter it in all directions. The phenomenon of scattering of light by sol particles to form illuminated beam or cone is called Tyndall effect or Tyndall beam or Tyndall cone.
Tyndall effect is not shown by true solutions because the ions or solute molecules are of such minute sizes that they cannot reflect light. The Tyndall effect can therefore be used to distinguish between a true solution and a colloidal solution. The hazy illumination of the light beams from the headlights of a car on a dusty road is a familiar example of Tyndall effect. Blue colour of sky and seawater, twinkling of stars and visibility of tails of comets are also due to scattering of light of Tyndall effect.
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