THE EXCHANGE OF IONS 
the electrical conductivity. The daily concentration of each solution 
during the experimental period of 19 days is shown in figure 2. 
^ I 2 3 4- 5 e 7 8 9 10 II IZ 13 1^ 15 16 17 13 19 
\ 
\ 
/ 
\ 
/ 
/■ 
/■ 
' i 
^\ 
i' 
/ 
K. 
— c 
NO- 
■% 
(NO 
^ 
^ 
3)2 
jfs 
>Mi. 
(NC 
— 1 
(Ni 
NO 
'3h 
3)a 
q(N 
O9) 
I a 3 ^ 5 6 7 a 9 10 II 12 13 14- 15 16 17 IS 19 
Fig. 2. Curves showing the change in concentration of the Ca(N03)2 and 
Mg(N03)2 solutions used in experiment 2. 
