A treatise on the theory of solution including the phenomena of electrolysis . hloride KCl and magnesium chloride MgClg. 6H2O, substanceswhich form a double salt of composition KCl. MgCls-GHgOcalled Carnallite. Here we have three components, namely,water and the two simplesalts; the double salt, notbeing an independent vari-able, is merely a possiblesolid phase. To obtain amonovariant system, whichis in equilibrium at onegiven temperature when thepressure is fixed, we mustassemble four phases, twobeing solids. Working atthe constant pressure of theatmosphere, and at a con-stant temperature of
A treatise on the theory of solution including the phenomena of electrolysis . hloride KCl and magnesium chloride MgClg. 6H2O, substanceswhich form a double salt of composition KCl. MgCls-GHgOcalled Carnallite. Here we have three components, namely,water and the two simplesalts; the double salt, notbeing an independent vari-able, is merely a possiblesolid phase. To obtain amonovariant system, whichis in equilibrium at onegiven temperature when thepressure is fixed, we mustassemble four phases, twobeing solids. Working atthe constant pressure of theatmosphere, and at a con-stant temperature of 25°, theconditions of such a systemare completely determined,and the liquid phase canhave only one , at the beginning ofthe deposition, the only solidphase is composed of thecrystals of the less solublesalt, the system is not de-termined, and the composi-tion of the liquid will vary as evaporation proceeds till a new solid phase appears. Thecomposition of the liquid phase then remains constant as longas both solids are deposited. The phenomena may be repre-. 10 20 30 40 Molecules K3 CL Fig. 66. ADDITIONS 405 sented on a diagram (Fig. 66), for which the necessary dataare given in the following table, the amount of potassiumchloride being reckoned in double molecules as K2CI3, for thesake of comparison with MgCl.,. Number of molecules per Substances saturatithe solution .6H2O Points onthe diagram AB CD thousand molecules of waterK3CI2 MgCl, 1 KCl KCl and CarnalliteCarnallite and ,0 445-510 0 72-5105108 Points lying inside the lines ABGD represent the compositionof unsaturated solutions; points on the line AB indicate thenumber of double molecules of potassium chloride whichsaturate the liquid as the amount of magnesium chlorideis increased; similarly the lines BC and CD representthe conditions of saturation with Carnallite and magnesiumchloride respectively. The points B and G, representing thecomposition of solutions simultaneously saturated with t
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