Question

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 :

• A. $\frac{V_{c}}{V_{s}} \approx 10^{3}$
• B. $\frac{V_{c}}{V_{s}}\simeq 10^{-3}$
• C. $\frac{V_{c}}{V_{s}}\simeq 10^{23}$
• D. $\frac{V_{c}}{V_{s}}\simeq 1$

Answer 1

Answer: (A)

$\frac{V_{c}}{V_{s}} \approx 10^{3}$

Answer 2

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$\quad\quad \frac{V_{c}}{V_{s}} = 10^{3}$