Page 288 - Introduction to Colloid and Surface Chemistry

Problems

k = 1.3805 x 1(T 23 JK' 1
N A = 6.0225 x lO^moP 1
1
R = 8.314 3 J K- moP 1
19
e = 1.602 1 x UP C
12 !
e 0 = 8.8542 x KP FnP
g = 9.806 6 m s~ 2
Volume of ideal gas at s.t.p. (0°C and 1 atm)
3
2
= 2.241 4 x HP m mop 1
5
1 atm = 760mmHg = 1.013 25 x 10 Pa
0°C = 273.15 K
In 10 = 2.302 6
TT = 3.141 56
1
4
rj (water, 25°C) = 8.9 x 10" kg m" s^ 1
(water, 25°C) = 78.5
e/€ 0
1. Calculate the average displacement in 1 min along a given axis
produced by Brownian motion for a spherical particle of radius 0.1 JAIH
suspended in water at 25°C.
2. The sedimentation and diffusion coefficients for myoglobin in
13
dilute aqueous solution at 20°C are 2.04 x 10" s and 1.13 x 10" 10
1
m 2 s" , respectively. The partial specific volume of the protein is
3 1 3
0.741 cm g" , the density of the solution is 1.00 g cm" and the
1
coefficient of viscosity of the solution is 1.00 x 10~ 3 kg in" 1 s" .
Calculate (a) the relative molecular mass and (b) the frictional ratio of
this protein. What is the probable shape of a dissolved myoglobin
molecule?
3. An aqueous solution of p-lactoglobulin in the presence of
sufficient electrolyte to eliminate charge effects was centrifuged to