CHAPTER XVIII

SYSTEMS OF FOUR COMPONENTS 312

Reciprocal salt-pairs. Choice of components, 313. Transition point, 314. Formation of double salts, 315. Transition interval, 315. Graphic representation, 316. Example, 317. Ammonia-soda process, 320. Preparation of barium nitrite, 327. Barium carbonate and potassium sulphate, 328.

APPENDIX

EXPERIMENTAL DETERMINATION OF THE TRANSITION POINT 331

I. The dilatometric method, 331. II. Measurement of the vapour pressure, 334. III. Solubility measurements, 335. IV. Thermometric method, 337. V. Optical method, 338. VI. Electrical methods, 338.

NAME INDEX 341

SUBJECT INDEX 345

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THE PHASE RULE