WORK OF C. M. STINE. 



17 



MIXTURE OF CALCIUM CHLORIDE AND POTASSIUM CHLORIDE. 



In order that each solution should have exactly one-half the normality after mix- 

 ing that it had before, the volume of the mixture was brought to exactly twice the 

 volume by the addition of either of the constituent solutions. 



Table 4. Data for Mixtures of Calcium Chloride and Potassium Chloride. 



Conductivity. 



m 



1.0CaCl 2 ... 



0.9 KC1 



1.4CaCI 2 ... 



1.3 KC1 



1.8CaCl 2 ... 



1.7 KC1 



2.2CaCl>... 



2.1 KC1 



2.7CaCU... 

 2.5945 KC1.. 

 3.1 CaCl 2 ... 

 2.5945 KC1.. 

 3.5106 CaCl 2 

 2.5945 KC1.. 



m c 



D 



t*v 



a 



0.5 



0.45 



0.7 



0.65 



0.9 



0.85 



1.1 



1.05 



1.35 



1.2972 



1.55 



1.2972 



1.755 



1.2972 



2.0000 

 2.2220 

 1.4285 

 1.5380 

 1.1111 

 1 . 1765 

 0.9090 

 0.9523 

 0.7407 

 0.7709 

 0.6451 

 0.7709 

 0.5698 

 0.7709 



0.04380 

 0.03033 

 0.05755 

 0.04361 

 0.07060 

 0.05680 

 0.08157 

 0.06897 

 0.09286 

 0.08395 

 0.09919 

 0.08395 

 0.10723 

 0.08395/ 



0.00416 

 0.00745 

 0.013309| 

 0.01973 i 

 0.02876 

 0.03232 i 

 0.03879 j 



fO. 04889 

 10.02769 

 f 0.05465 

 10.03906 

 (0. 06522 

 10.04888 

 ( 0.07335 

 10.05746 

 10.08041 

 10.06765 

 (0.05779 

 10.06502 

 fO. 09183 

 10.06056 



84.6 

 61.5 

 78.1 

 60.0 

 72.5 

 56.5 

 66.7 

 54.7 

 59.6 

 52.2 

 55.4 

 50.1 

 52.3 

 46.7 



0.573 

 0.766 

 0.529 

 0.748 

 0.491 

 0.716 

 0.452 

 0.681 

 0.404 

 0.649 

 0.375 

 0.624 

 0.355 

 0.581 



Weight-normal corrections. 



Freezing- 

 point. 



m 



W 30t 



W salt 



Wh& 



Correction, 

 per cent. 



1.0CaCl 2 +0.9KCl.. 

 1.4CaCI 2 +1.3KCI.. 

 1.8 CaClj+1.7 KC1.. 

 2.2 CaCl 2 +2.1 KC1.. 

 2.7CaCl 2 +2.59KCl. 

 3.1CaCl 2 +2.59KCl. 

 3.51 CaCl 2 +2.59 KC1 



26.7448 

 27.3662 

 28.0354 

 28.6177 

 29.4220 

 29.8247 

 30.2118 



2.22637 



3.1542 



4.0827 



5.0102 



6.1655 



6.7205 



7.2793 



24.51843 



22.2120 



23.9527 



23.6075 



23.2565 



23.1042 



22.9235 



7.6 

 8.3 



4.413 

 6.625 

 9.17 

 12.01 

 15.00 

 16.50 

 18.0 



In table 4, m is the normality of the solutions mixed. When equal volumes are 

 mixed the resulting normality of each solution is exactly one-half of that of the solu- 

 tions before mixing. This is given under m c . V c is the number of liters of solution 

 that will contain a gram-molecular weight of the salt, based on m c . k u is the specific 

 conductivity of the mixture. This would be the sum of the conductivities of the 

 component solutions if no suppression of the ionization occurred. In each case the 

 sum of these two, minus the conductivity of the mixture, k u , gives the decrease in 

 conductivity due to the driving back of the dissociation of the salts in question. 

 This is given under D. This loss in conductivity is then apportioned to each elec- 

 trolyte by the method already described, and the resulting conductivities are given 

 under k e . From this, fx and a are obtained. 



Proceeding upon the tentative hypothesis that the calcium chloride forms the 

 same hydrates in the presence of a salt with no hydrating power that it forms in 

 separate solution, the values in table 5 were calculated. 



