|Institution:||University of Canterbury|
|Full text PDF:||http://hdl.handle.net/10092/8077|
The reasons causing temperature and volume changes due to the mixing of non-aqueous liquids are varied. The phenomenon is probably complex because of the processes that may happen during true solution such as association, disassociation, chemical combination and thermal deassociation. Should these processes become superimposed then investigation of the main reasons become complicated. As one of the most important accompaniments of a spontaneous chemical combination is the production of heat it seems justifiable to assume that where heat derivation is great, then chemical combination many be taken as a primary cause of the heat change and its aspects should be worth studying. A notable example is the binary mixture ether-chloroform and the work described in the following pages as undertaken with the object of finding out what factors affect the heats of reaction of this mixture, and whether it is possible to determine from the measurements of this property, the composition of a compound that might exist in a liquid mixture containing these constituents. In the past other properties have been studied especially physical properties, with the object of elucidating the nature of the compound or compounds formed on the admixture of non-aqueous liquids, as well as this thermal property which occurs so frequently on mixing. This from freezing point measurements Wyatt (1) confirmed Smits and Berckmans (2) experiments which included the existence of four separate compounds of ether and chloroform at low temperatures. As to whether these compounds existed in the liquid state at the temperatures worked at in the experiments on the heats of reaction could only be proved by an examination of the results obtained. One compound these experiments obtained, that at equimolecular proportions of the two constituents, was of particular interest as this mixture gave in the preliminary experiments the greatest heat effect.