[350] See Van't Hoff and van Deventer, Zeitschr. phys. Chem., 1887, 1. 165.
[351] Meyerhoffer, Zeitschr. physikal. Chem., 1890, 5. 121.
[352] Roozeboom, Zeitschr. physikal. Chem., 1888, 2. 518.
[353] Meyerhoffer, Zeitschr. physikal. Chem., 1890, 5. 109. On the importance of the transition interval in the case of optically active substances, see Meyerhoffer, Ber., 1904, 37. 2604.
[354] In connection with this chapter, see, more especially, van't Hoff, Bildung und Spaltung von Doppelsalzen, p. 3, ff.; Roozeboom, Zeitschr. physikal Chem., 1892, 10. 158; Bancroft, Phase Rule, p. 201; 209.
[355] The same restriction must be made here as was imposed in the preceding chapter, namely, that the two salts in solution give a common ion.
[356] For example, addition of ammonium chloride to solutions of ferric chloride (Roozeboom, Zeitschr. physikal. Chem., 1892, 10. 149).
[357] It must, of course, be understood that the temperature is on that side of the transition point on which the double salt is stable.
[358] Excess of the double salt must be taken, because otherwise an unsaturated solution might be formed, and this would, of course, not deposit any salt.
[359] Meyerhoffer, Ber., 1904, 37. 2605.