Different systems of two components, 77. PHENOMENA OF DISSOCIATION. Bivariant systems, 79. Univariant systems, 80. Ammonia compounds of metal chlorides, 82. Salts with water of crystallization, 85. Efflorescence, 86. Indefiniteness of the vapour pressure of a hydrate, 87. Suspended transformation, 89. Range of existence of hydrates, 90. Constancy of vapour pressure and the formation of compounds, 90. Measurement of the vapour pressure of hydrates, 91. CHAPTER VI SOLUTIONS 92 Definition, 92. SOLUTIONS OF GASES IN LIQUIDS, 93. SOLUTIONS OF LIQUIDS IN LIQUIDS, 95. Partial or limited miscibility, 96. Phenol and water, 97. Methylethylketone and water, 100. Triethylamine and water, 101. General form of concentration-temperature curve, 101. Pressure-concentration diagram, 102. Complete miscibility, 104. Pressure-concentration diagram, 104. CHAPTER VII SOLUTIONS OF SOLIDS IN LIQUIDS, ONLY ONE OF THE COMPONENTS BEING VOLATILE 106 General, 106. The saturated solution, 108. Form of the solubility curve, 108. A. ANHYDROUS SALT AND WATER. {xiii} The solubility curve, 111. Suspended transformation and supersaturation, 113. Solubility curve at higher temperatures, 114. (1) _Complete miscibility of the fused components._ Ice as solid phase, 116. Cryohydrates, 117. Changes at the quadruple point, 119. Freezing mixtures, 120. (2) _Partial miscibility of the fused components._ Supersaturation, 124. Pressure-temperature diagram, 126. Vapour pressure of solid--solution--vapour, 126. Other univariant systems, 127. Bivariant systems, 129. Deliquescence, 130. Separation of salt on evaporation, 130. General summary, 131. CHAPTER VIII SOLUTIONS OF SOLIDS IN LIQUIDS, ONLY ONE OF THE COMPONENTS BEING VOLATILE 133 B. HYDRATED SALT AND WATER, (1) _The compounds formed do not have a definite melting point._ Concentration-temperature diagram, 133. Sodium sulphate and water, 134. Suspended transformation, 137. Dehydration by means of anhydrous sodium sulphate, 138. Pressure-temperature diagram, 138. (2) _The compounds formed have a definite melting point._ Solubility curve of calcium chloride hexahydrate, 145. Pressure-temperature diagram, 149. The indifferent point, 150. The hydrates of ferric chloride, 151. Suspended transformation, 155. Evaporation of solutions at constant temperature, 155. Inevaporable solutions, 157. Illustration, 158. CHAPTER IX EQUILIBRIA BETWEEN TWO VOLATILE COMPONENTS 161 General, 161. Iodine and chlorine, 161. Concentration-temperature diagram, 162. Pressure-temperature diagram, 165. Bivariant systems, 167. Sulphur dioxide and water, 169. Pressure-temperature diagram, 170. Bivariant systems, 173. CHAPTER X