344 



Dr. G. Gore on CliemicaT 



Distilled water was used in making all the solutions. In 

 making them the following rules were observed :— In each 

 Table, Nos. I. to X. and XIII. to XV., under the head of " In- 

 gredients/'' each ingredient — halogen, acid, or salt, as the case 

 might be — was dissolved in the proportion of one equivalent 

 weight in grains of the absolute substance in one unit 

 quantity or 511,500 grains of water ; in Tables XI. and XII. 

 the proportion of water was 1800 grains. Under the head of 

 "Mixtures," an equivalent quantity in grains of each of the 

 two or more substances forming the mixtures was collectively 

 dissolved in a single unit quantity of water ; but in Table V. 

 two unit quantities in grains of one of the ingredients was 

 included, as shown by the formulae given. The substances 

 employed were of a high degree of purity. 



The experiments are divided into three chief sections, viz., 

 Section A, Halogens -}- Salts ; B, Halogens + Acids ; and C, 

 Halogens + Bases. 



Section A. — Halogens + Salts. Positive metal, Zinc. 

 Table I. — Influence of a Halogen + a Salt. 



Ingredients. E.M.F. 



Mixtures. E.M.F. 



Calculated 

 E.M.F. 



Change of Per 

 E.M.F. cent. 



Br. 1-8706 

 KCl. 1-1927 

 CI. 1-9250 

 KBr. 1-1556 



Br + KCl. 1-7276 

 Cl+KBr. 



1-5450 

 1-3323 



Gain -1826 =11-81 

 „ -3953 2967 



I. 1-4410 

 KI. 1-1470 



I+KC1. 1-40156 

 Cl+KI. 



1-3501 

 1-2840 



Gain -05146= 381 

 „ -11756 915 





I+KBr. 1-3844 

 Br+KI. 



1-3029 

 1-3823 



Gain '0815 = 625 

 „ -0021 -15 



In each of these three cases of isomeric couples, each of 

 the two mixtures gave the same amount of electromotive 

 force, and had therefore acquired the same chemical and 

 molecular composition at once on mixing. 



Table II. — Influence of a Halogen 4 two Salts. 



Mixtures. 



E.M.F. 



Calculated 

 E.M.F. 



Change of 

 E.M.F. 



Per 

 cent. 



Cl+(KBr+KI). 

 Br+(KCl+KI). 

 I+(KCl+KBr). 



1-5274 

 1-4702 

 1-3787 



1-2376 

 1-3101 

 1-2806 



Gain -2898 = 

 •1601 

 •0981 



= 23-41 



1222 



7-65 



