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Question
What happens when an emulsion is centrifuged?
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Solution
An emulsion is centrifuged because it is a colloidal dispersion. Also, it exhibits all the properties shown by colloidal sols, that is, Tyndall effect, Brownian movement, electrophoresis, etc.
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The right option for the statement “Tyndall effect is exhibited by”, is:
The conditions given below are in the context of observing Tyndall effect in colloidal solutions:
- The diameter of the colloidal particles is comparable to the wavelength of light used.
- The diameter of the colloidal particles is much smaller than the wavelength of light used.
- The diameter of the colloidal particles is much larger than the wavelength of light used.
- The refractive indices of the dispersed phase and the dispersion medium are comparable.
- The dispersed phase has a very different refractive index from the dispersion medium.
Choose the most appropriate conditions from the options given below:
6.84 g Al2(SO4)3 is needed to coagulate 2.5 L of As2S3 sol completely in 2.0 hrs. The coagulation value of Al2 (SO4)3 is ______.
