why is tyndall effect not seen in a true solution ?
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The scattering of light by colloidal particles is known as tyndall effect.
A colloid is a heterogeneous mixture.The particles of a colloid is too small to be individually seen by naked eyes but they are large enough to scatter a beam of light passing through it and make its path visible.But a solution is a homogeneous mixture.The particles of a solution are smaller than 1nm(10⁻⁹ m).So they are unable to scatter a beam of light passing through it.Hence,tyndall effect is not seen in a true solution.
A colloid is a heterogeneous mixture.The particles of a colloid is too small to be individually seen by naked eyes but they are large enough to scatter a beam of light passing through it and make its path visible.But a solution is a homogeneous mixture.The particles of a solution are smaller than 1nm(10⁻⁹ m).So they are unable to scatter a beam of light passing through it.Hence,tyndall effect is not seen in a true solution.
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Size of the Particles
Explanation:
- Tyndall effect occurs only when the light beams passes through a colloid due to which it scatters in the solution and separates the light
- The particles of suspension shows Tyndall effect and scatter and reflect light, that makes the beam visible.
- The amount of scattering of light depends on the frequency of light and diameters of particles and the density of the particles
- In a true solution the particles are not as large enough as that of a colloidal solution (1 n.m - 1000 n.m) which distinguishes them and are not able to scatter the light
- This is the reason that Tyndall effect is not seen in true solution
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