318 ON THE CALCULATION OF THE CONDUCTIVITY OF 
These results show that in the case of solutions containing 
equi-molecular quantities of Zinc and Copper Sulphate up to 1 
gramme-equivalent per litre, the calculated and observed values 
of the conductivity agree within the limits of observational 
error. 
Observations on Solutions Containing Sodium and 
Potassium Sulphate. 
Table VI contains the results of calculations and observations 
on some mixtures of equal volumes of equi-molecular solutions 
of Sodium and Potassium Sulphates, of the same range of con- 
centration as those of the Copper-Potassium Sulphate solutions 
and Zine-Copper mixtures examined. The data for the drawing 
of the ionic concentration-dilution curve for Potassium Sulphate 
TABLE, Vil. 
Concentration of the 
Constituent Solu- | Concen- Dilution in the Conductivity of Mixture. 
tions. tration of Mixtnre. 
a _ one 
A t-ee ae Mixture. FLEAS | Ge ; . 
5 K,SO,, 4 Na,SO,. 4 K,SO,. 4 Na,SO,. Calor’ Observed peer 
————— ——— Cam - —-= ——ees 2 ee — 
1.000 1.000 | .483 1.096 | 904 | 570.0 | 568.5 +0.26 
.909 .909 448 1.202 | .998 | 528.1 | 526.6 +0,.29 
-750 -750 004 1.4382 | 1.234 | 451.9 | 452.8 —0.19 
.6666 .6666 435) 1.605 1.395 | 413.3 | 414.4 — 0.26 
.5000 .5000 .276 2.105 | 1.895 | 323.8 | 324.6 — 0,24 
.4000 -4000 .228 2:60 | 2.40 | 267.7 | 267.2 +0.19 
2000 | .2000 | .1254 | 514 | 486 | 1471! 47.3 ~0.13 
. L000 .1000 .0696 10.06 | 9.94 81.40} 81.49 -011 
.O800 .0800 .0571 | 12.56 | 12.44 66.82) 66.70 +0.18 | 
.0750 .O750 0540 is yil0) yy so) 63 12} 63.02 +0.15 
.O6CO -0600 0441 16.76 16.56 51.60; 51.67 — 0.13 
.0500 .0500 03872 20.16 19.84 43.48] 43.51 — 0.07 
