The phase rule and its applications . he amount of theamine, the temperature of equilibrium rises, the solid phasenow being the compound. At D, the curve passes through amaximum (288°), at which the solid and liquid phases havethe same composition. This is the melting point of the com-pound. Further addition of the amine lowers the temperatureof equilibrium, until at E solid a-naphthylamine separates out,and a second eutectic point (24*0°) is obtained. BE is the 1 J. C. Philip, fount. Chem. Soc, 1903, 83. 821. 2 Cf. also Paterno and Ampolla, Gazzetta rhim. ital., 1897, 27. 481.• Philip, loc. c
The phase rule and its applications . he amount of theamine, the temperature of equilibrium rises, the solid phasenow being the compound. At D, the curve passes through amaximum (288°), at which the solid and liquid phases havethe same composition. This is the melting point of the com-pound. Further addition of the amine lowers the temperatureof equilibrium, until at E solid a-naphthylamine separates out,and a second eutectic point (24*0°) is obtained. BE is the 1 J. C. Philip, fount. Chem. Soc, 1903, 83. 821. 2 Cf. also Paterno and Ampolla, Gazzetta rhim. ital., 1897, 27. 481.• Philip, loc. cit., p. 826. APPLICATION OF THE PHASE RULE 217 freezing-point curve of a-naphthylamine in presence of phenol,the freezing point of the pure amine being 483°- On account of the great sluggishness with which the com-pound of phenol and a-naphthylamine crystallizes, it was foundpossible to follow the freezing point curves of phenol and theamine to temperatures considerably below the eutectic points,as shown by the curves CF and 30 40 50 60 70 Molecular percentage of a-naphthylamine. Fig. 67. Phenol can also combine with /-toluidine in equimolecularproportions; and this compound is of interest, from the factthat it exists in two crystalline forms melting at 28-5° and of these forms now must have its own equilibrium curve,and it was found that the intermediate portion of the freezingpoint curve was duplicated, as shown in Fig. 1 Philip, he. p. 829. Compare curves for iodine monochluride,Fig. 42, p. 162. 21! THE PHASE RULE 45C 30 A \ / A \ \ ,4 iP ?^ ^ \ / \ : \ . > r \f V u 1 0 2 > 3 4 > 5 3 6 3 7 3 80 gc > 100 Molecular percentage of toluidine. Fig. 6$. J) C6B2(N02) 122,2° ; C6H2(N02\,H6 303/ CeHt(N02)3OH (both solid) K> 84,3° Solution \ Vapour : C6H2(N02), 1,333/ C6//6 (&otfi solid) A } ° ^M^07l Forpoitr a ; 5,02° /</ 20 ^ GO 70 SO #0 100 I/O 120 130 Fig. 69. APPLICATION OF THE PHASE RULE Lastly, a cu
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