328

THEORY

OF

BROVNIAN

MOTION

Substituting

this

value of

k

and

the value of

v

obtained

from

the

previously

found equation,

l

v=

96,000'

in

equation

(2),

we

get

a,

k

108-9,600-96,000

^

= =

t^

With

the usual definition

of

l,

this formula holds

for

polyvalent

ions

as

well.

Substituting

this value for

in equation

(8),

we

get

A

=

4.25-10"5.

The

formula

yields

for

room

temperature and

r=1

[19]

Ion

l

A

in

microns

H

300 125

K

65 58

Diisoamylammonium

ion

C10H24N

24 35

Received

on

1

April