680 DOC.
639
OCTOBER
1918
CuCl2+
2H2O
Water
Vol.
of
Solution
Spec.
Wt.
of
Solution
Drip
Time of
Solution
Temp Drip
Time of
Water
2
g
98
cc
ca.
99
cc
55
s
15.5° 54
4
g
96 ”
ca.
98 ” 55.4
16° 53
6
g
94 ”
ca.
97 ” 55.8 16.5°
51
10
g
90
”
ca.
93.5”
1.092 60 " "
14
g
86 ”
ca.
91
” 65 " "
16
g
84 ”
ca.
89.5”
67.3 " "
20
g
80 ”
ca.
87 ” 1.222 75.3
" "
30
g
70 ”
ca.
81
1.362 89 "
"
40
g
60 ”
ca.
74.5 1.528 104.7 18° 50.3
50
g
50
”
ca.
683/4
148.5 " "
The
spec-
cific wts.
of
the
solutions
are
taken
from
data
in
the
literature.
If
n'T
means
the
friction,
which
is
calculated out of V'
=
change
in
volume;
n's
is
the
one
calculated
out
of V'
=
-weight/spec.
wt.
(2.4) then
results,
for
K
=
5,
%
n'r
V’s
n'obser.
2
56.7
54.2 55
4 58.3 57.5 55.4
6 58.9 57.6 55.8
10
60.7 62.7
60
14
65.0
67.3
65
16 66.6 70 67.3
20 71.4 75.5 75.3
30
85.7 91.8
89
40 99.1 106.0 104.7
On
the
whole,
there
is
thus
no
great
differ-
ence
between whether
the
volume
is
calculated
from
the
change
in volume
or
from the
specific
weight
of the
dry
substance. In
both
instances,
the
result
agrees sufficiently
with
observation.
From
this
it would
probably follow
that
also
in solution
the
crystallization
water
remains
within
the
molecular
bond.-
The
values
I
find indicated for
the
specific weights
of
the
solutions
I
can
reconcile
neither
with
the
dry
substance’s
specific weight
nor
with the
volume
increase
upon dissolving
the
corresponding weighed
amounts
of
copper
chloride.-
The
molecular volume results from
the
dry
substance’s
specific weight
at
0.41,
from
the
solution’s increase in volume at 0.34-0.5
(at
a mean
of
0.40),
from
the
friction at 0.3-0.415
(at
a mean
of
0.36),
whereas from
the
spec.
wt.
of
the
solutions at
0.16; 0.09;
0.11;
0.14.
Anhydrous CuCl2 yields
the
following
figures:
77
for water
49s-.