Page 300 - Introduction to Colloid and Surface Chemistry

Answers 289

29. C (inner part of double layer) = 0.106 F m~ 2
6/eo (inner part of double layer) = 4.8 (suggesting orientation of
water molecules close to the surface)
1
8
2
30. (a) ME = 1-5 x 10~ m s" V" 1
(6) 3.3 per cent
(c) 19.2 mV (using Smoluchowski equation; KU ** 260)
(</) 0.014 Cm" 2
31. g — 51 mV (using Smoluchowski equation; KO «* 140; therefore,
calculated £ is probably an underestimate)
5
1
3
32. 5 x 10~ cm s" towards — ve electrode
33. H/nm 0.5 2 5 10 20
21
V/1<T J -73 +62 +12 -10 -8
12 3 1
34. k 2 = 4.8 x 10" cm s"
12
3
= 6.2 x 10~ cm s' 1
35: M r = 118000
(light-scattering, mass-average) > (viscosity) >
M T M r M r
(osmotic pressure, number-average)
5
3
36. [17] = 1.6 x 10~ M° T m m kg' 1
Average polymer configuration intermediate between extended
and random