DOC.
2
17
It should also
be
briefly noted that the Nernst
theory
of electric
forces inside dissociated electrolytes, taken
in
conjunction
with the first of
equations
(4),
makes
it
possible
to
calculate the electromotive force
of
the
concentration cell.
Thus
one
arrives
at
a
result that
has already been
tested
repeatedly and
that till
now
has been
derived
from special
assumptions.
[7]
§3.
On
the
dependence
of
the quantity
AII on
the nature of the
acid
We
shall consider the
following
ideal
state
of
equilibrium:
Let
us
again
have
a
cylindric
vessel. Parts
I
and
II
shall
each
contain
a
completely
dissociated salt
solution;
the
two
salts shall
have
an
identical
metal ion
(same
metal
and
same
electric
charge)
but
a
different acid ion.
Between
the
two
parts
there shall
be
a
connecting
space
V
which
contains both salts
in
solution.
Upon
the acid ions in
V
shall
act
forces
whose
potentials
Ps(1)
and Ps(2)
depend only
on
z,
and
these forces shall
bring
about that
only
infinitesimally
few
acid ions of the first
and
of the
second
type
get
into
II
and
I,
respectively.
Furthermore,
Ps(1)
and Ps(2) shall
be chosen
such that the metal
ion
concentration
in
the
two
parts
I
and II
be
the
same.
Also, let
p01
=
p02.
If there
are
per
unit
volume
vm(1)
and
vm(2)
metal
ions that
correspond
to
the first
and second
type
of salt,
respectively,
then
(1)
l/\(1)
-y\o y
£
ml
S1
=
j,(2)
j/(\
2) 0,
!/*
=
0
52
where
the
subscripts
refer
to
space
I
and
II,
respectively.
However,
the condition for
the
equilibrium
of the metal ions in
V
yields