445 
1909-10.] Equilibrium in a Ternary System. 
The points for Nos. 8 and 9 lie on these curves produced. If the two 
curves are produced still further, they meet and form one continuous curve 
at the point where the two layers become homogeneous. This occurs when 
the composition of the two layers is identical. The percentage of each 
salt in the solution at this point can be determined from the curves in 
fig. 2. The curve to the left shows the connection between the percentage 
of potassium ethyl salt in the upper and lower layers respectively, while 
that to the right represents similarly the percentages of potassium carbonate 
in the two layers. A line drawn through the origin at an angle of 45° to 
the axes cuts the curves at points which give the percentage of potassium 
ethyl salt, and of potassium carbonate when the two layers become identical. 
Thus when the solution becomes homogeneous it contains 11 *6 per cent. 
