Question

The volume of collodial particle VC as compared to the volume of a solute particle in a true solution VS could be:

• A. ~ 1
• B. ~ 1023
• C. ~ 10–3
• D. ~ 103

Answer 1

Answer: (D)

~ 103

Answer 2

For true solution the diameter range is 1 to 10 Å and for colloidal solution diameter range is 10 to 10,000 Å.

$\frac { \mathrm { V } _ { \mathrm { C } } } { \mathrm { V } _ { \mathrm { S } } } = \frac { ( 4 / 3 ) \pi \mathrm { r } _ { \mathrm { c } } ^ { 3 } } { ( 4 / 3 ) \pi \mathrm { r } _ { \mathrm { s } } ^ { 3 } } = \left( \frac { \mathrm { r } _ { \mathrm { C } } } { \mathrm { r } _ { \mathrm { S } } } \right) ^ { 3 }$

Ratio of diameters = (10/1)3 = 103 Vc / Vs = 103.