An example of this is found in the three substances: chloroform, water, and acetic acid.[320] Chloroform and acetic acid, and water and acetic acid, are miscible with one another in all proportions, but chloroform and water are only partially miscible with one another. If, therefore, chloroform is shaken with a larger quantity of water than it can dissolve, two layers will be formed consisting one of a saturated solution of water in chloroform, the other of a saturated solution of chloroform in water. The composition of these two solutions at a temperature of about 18°, will be represented by the points _a_ and _b_ in Fig. 84; _a_ representing a solution of the composition: chloroform, 99 per cent.; water, 1 per cent.; and _b_ a solution of the composition: chloroform, 0.8 per cent.; water, 99.2 per cent. When acetic acid is added, it distributes itself between the two liquid layers, and two conjugate _ternary_ solutions, consisting of chloroform, water, and acetic acid are thereby produced which are in equilibrium with one another, and the composition of which will be represented by two points inside the triangle. In this way a series of pairs of ternary solutions will be obtained by the addition of acetic acid to the mixture of chloroform and water. By this addition, also, not only do the two liquid phases become increasingly rich in acetic acid, but the mutual solubility of the chloroform and water increases; so that the layer _a_ becomes relatively richer in water, and layer _b_ relatively richer in chloroform. This is seen from the following table, which gives the percentage composition of different conjugate ternary solutions at 18°. ------------------------------------------------------------------------- Heavier layer. | Lighter layer. ------------------------------------------------------------------------- Chloroform. | Water. | Acetic acid. | Chloroform. | Water. | Acetic acid. ------------------------------------------------------------------------- 99.01 | 0.99 | 0 | 0.84 | 99.16 | 0 91.85 | 1.38 | 6.77 | 1.21 | 73.69 | 25.10 80.00 | 2.28 | 17.72 | 7.30 | 48.58 | 44.12 70.13 | 4.12 | 25.75 | 15.11 | 34.71 | 50.18 67.15 | 5.20 | 27.65 | 18.33 | 31.11 | 50.56 59.99 | 7.93 | 32.08 | 25.20 | 25.39 | 49.41 55.81 | 9.58 | 34.61 | 28.85 | 23.28 | 47.87 ------------------------------------------------------------------------- {242}