Articles written in Proceedings – Section A
Volume 44 Issue 6 December 1956 pp 375-386
The solubility isotherms of the ternary systems ammonium sulphate-water-methanol and ammonium nitrate-water-methanol have been determined at 30° employing an efficient solubility apparatus. Neither of the two systems reveals the formation of solvated solid phases or of binary solutions. Methanol greatly reduces the aqueous solubility of ammonium sulphate but it has little effect on that of ammonium nitrate when added in moderate amounts. Very large amounts of methanol, however, actually increase the solubility of ammonium nitrate in water. Salt solubilities in a binary solvent of varying composition have been represented diagrammatically. The relationship between the logarithm of molality of the salt in solution and the mole fraction of methanol in the binary solvent in both the systems is in accord with the general observations of Akerlof and Turck.
Volume 60 Issue 1 July 1964 pp 25-30
Crystals which are hygroscopic or which exist only at low temperatures can be conveniently studied on an optical goniometer with the attachment and method described. The apparatus is simple in design and uses a current of air (or gas) at suitable temperature blowing on the crystal mounted on a goniometer head inside a glass chamber.