( 25G ) 



Kj COs ; OPB is tlic coniKuliil liiic with the pliiit-poiiit P; with each 

 liquid phase of part OP one of PB can be in equilibrium. Mr. df, 

 BuuiJN has determined the situation of the connodal line OPB at 

 different temperatures. Just as in the preceding system the points 

 and E approach each other when the temperature is lowered ; in 

 the preceding system they met at :t8°; in this system however no 

 earlier than at ± — 33°. 



III. Tlie ftystcm : rotansnunearhoiinle^ efhijJaJlvlrjl and iratcr. 



The isotherm has hei'e the same form as in the preceding system. 

 The composition of the two liquid phases in equilibrium witb the 

 hydrate was determined at temperatures of — 18° to 75°. The propor- 

 tion of salt rises with the temperature, that of alcohol changes less 

 than the amount of the faults of analysis. That a change in the composi- 

 tion of the two liquid phases does however decidedly take place when 

 the temperature is changed may be deducted from the observation, that 

 such homogeneous solutions divide into two liquid phases at a change in 

 the temperature. Different pairs of conjugated points were determined 

 on the connodal line at 17° and at 35°. The connodal lines for dif- 

 ferent temperatures intersect here too. Sections, as in the case of 

 ammoniumsulphate are not determined here; from a single observa- 

 tion made by Snell it may be deduced that these sections will not 

 show a maximum here but a minimum. 



A great difference in the conduct of methyl- and ethylalcohol is shown 

 by what follows. At 17° the upper layer contains in equilibrium with 

 tlie solid phase 91,5 pCt. ethylalcohol and 0,OG pCt. KoCO;;; the lower- 

 layer 0.2 pCt. ethylalcohol and 55.2 pCt. K2CO3. The ethylalcohol and 

 the potassiumcarbonate form therefore each of them, with part of the 

 water, a liquid in which the other component hardly occurs. In the 

 system KoCOsjClIgOH and H3O the upper layer contains however at the 

 same temperature 09,6 pCt. incthylalcohol and 0,25 pCt. KoCOg. the 

 lower layer 5,7 pCt. methylalcohol and 48,4 pCt. K3CO3. Another great 

 difference in the conduct of m.ethyl- and etiiylalcohol in these systems 

 is the following. In the system with ethylalcohol the temperature has 

 hardly any influence on the position of the points and B; the 

 projjortion of water and alcohol remaining in two liquid phases, that 

 are in equilibrium with the solid hydrate of K^ CO:;, nearly unal- 

 tered from — 18° to + 75°. In the system with methylalcohol the 

 temperature has on the other hand a great influence on the propor- 

 tion of water and methylalcohol, the latter being more miscible in 

 presence of the solid salt than water and etiiylalcohol. 



