IN AQUEOUS SOLUTION, AND THE EXISTENCE OF COMPLEX IONS. 
131 
bromide and silver nitrate of different concentrations to those given in the table. In 
Li r 
the former case, the — Br and in the latter the Ag boundaiy could not he 
_iN R ^3 
made to move with a constant velocity or without “washing” under any of the 
varied conditions tried. For the first salt, no other indicator has as yet been used ; 
for the second, no other anion whose silver salt was soluble has suggested itself 
for trial. 
In Table V. is given the ratio of the current, as measured by the galvanometer, 
to that calculated from the inargin velocities. For potassium and sodium chlorides, 
potassium and sodium bromide, potassium hydroxide, and 0'5 N lithium chloride, this 
ratio is, as required by theory, within the limits of experimental error, equal to unity. 
On the other hand, this is not the case for all the other salts examined, the closest 
agreement with theory being shown by the more dilute solutions ; for example, 
0‘5 N magnesium chloride and 0‘2 N magnesium sulphate. Only for one salt have 
duplicate measurements been made, namely, for 0‘5 magnesium sulphate, but here 
the results are in accordance. 
Table V. 
Salt. 
N. 
Ct 
Salt. 
N. 
Ct 
Salt. 
N. 
C)/ 
AN(U + V)- 
AN(U + V)-! 
1 
AN(U + V)- 
KCl . . 
0-5 
0-98-t 
BaCl.j . 
0-5 
0-956 
MgS 04 . 
0-183 
0-980 
2-0 
1-009 
1-0 
0-944 
r 
0-5 
0-949 y 
NaCl. . 
1-0 
0-989 
2-0 
0-956 
1 
0-5 
0-951 J 
2-0 
1-004 
SrClo. . 
0-5 
0-870 
1-0 
0-977 
KBr . . 
0-1 
0-978 
1-0 
0-916 
2-0 
0-956 
0-5 
1-000 
2-0 
1-080 
2-0 
0-807* 
1 -0 
1-031 
CaCl, . 
0-5 
1-04 
2-0 
0-814T 
2-0 
0-998 
1-0 
1-03 
CuS 04 . 
1 -0 
1-06 
NaBr . 
0-5 
1-001 
2-0 
0-973 
2-0 
0 - 965 
LiCl. . 
0-5 
1-006 
MgClo . 
0-5 
1-01 
K.CrO.,. 
0-5 
0-965 
1-0 
1-070 
1 -0 
1-05 
2-0 
0-910 
KOH . 
0-57 
1-02 
2-0 
0 - 968 
* M.VSSON, in gelatine. 
t Steele, in gelatine. 
Masson has found that for this salt the ratio as measured in gelatine is considerably 
less than I. Under 2'ON, MgSO_^, are given in the table the values found by the 
author in aqueous and in gelatine solution, and also Masson’s number found in 
gelatine ; a difference is here to he noted corresponding with that already j)ointed out 
for the transport number. 
For the calculation of the current the avei'age is taken, this being obtained from 
the area of the time-current curve, and for the velocities the total distance moved 
over divided by the time in seconds. 
s 2 
