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  4. The volume of a colloidal particle, VC as compared to the volume of a solute particle in a true solution VS, could be :

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Q. The volume of a colloidal particle, $V_C$ as compared to the volume of a solute particle in a true solution $V_S$, could be :

AIEEEAIEEE 2005Surface Chemistry

Solution:

Size of colloidal particles = 1 to 100 nm (say 10 nm)
$V_{c} = \frac{4}{3}\pi r^{3} = \frac{4}{3}\pi\left(10\right)^{3}$
Size of true solution particles $\approx$ 1 nm
$V_{s} = \frac{4}{3}\pi \left(1\right)^{3}$
Thus$\quad\quad \frac{V_{c}}{V_{s}} = 10^{3}$