Section III., 1913. [207] Trans. R.S.C 



Researches in Physical Chemistry carried out in the University of Toronto, 



VII. 



Communicated by 

 Peof. W. Lash Miller, and Prof. Frank B. Kenrick, F.R.S.C. 



(Read May 28, 1913) 



No. 1. Frank B. Kenrick: — The hydrates and acid salts of ferrous 

 sulphate. The compositions of a number of ferrous sulphates and their 

 ranges of existence with sulphuric acid solutions at ordinary tempera- 

 tures have been determined. The composition of the solid phase was 

 obtained by a combination of two methods of indirect analysis, each of 

 which alone was insufficiently accurate for the purpose. In the first 

 method, the analyses of liquids and corresponding wet solids gave the 

 values of a and 6 in a number of equations to straight lines : 



y = ax -}- b y = a^x + b^ etc. 



in which i/ represents the amount of ferrous oxide (FeO) and x the amount 

 of water (H^O) to unit quantity of sulphuric anhydride (SO^), and the 

 points on which correspond to possible compositions of the solid phase. 

 In some cases the values of x and y representing the values of the actual 

 solid, could be determined from the cutting point of these lines; in 

 others the smallness of the angles made this impracticable. In 

 the second method, each analysis ot liquid and wet solid gave the value 

 of y fairly accurately, although the value found for x was too inaccurate 

 to be of any use. By combining the two methods and substituting 

 the value of y given by the second method in any of the equations 

 obtained by the first, the value of x could be determined. 



The following chemical compounds were identified: — FoO. SO3. 

 HjO, stable in contact with solutions of composition varying from 

 SO,: 2-186 H 2O to SO3: 7-93 HjO at which point the heptahydrate 

 was formed. 2FeO. 3SO3. 211 2O (?) stable with solutions SO3: 1-637 

 H2O to SO3: 2.186H.,0. FeO. 2SO3. ^2^ existing with solutions 

 S63: 1.342 H2O to (about) SO3: 1-595H,0. FeO. 4SO3. 3H2O 

 stable with solutions ranging from strongest one investigated viz. : — 

 SO3: I-I22H2O to about SO3: I.342H2O. (Jour. Phijs. Chem. 12. pp. 

 693-705, 1908). 



No. 2. W. Lash Miller and R. H. l\IcPherson:~The behaviour 

 of colloidal suspensions with immiscible solvents. A study of the behav- 

 iour of colloidal suspensions of arsenious sulphide, etc.. in different 



