OF AQUEOUS SOLUTIONS.—BARNES. 135 
Determination of p. 
When equal volumes of simple solutions are mixed the ratio 
expressed by p is equal to the ratio of the specific gravity of the 
mixture to the mean specific gravity of the constituent solutions. 
Table II shows that the ratio is practically equal to unity for 
the most concentrated solutions examined. 
TABLE II. 
| SIMPLE SOLUTIONS. 
Sp. Gr. 
Concentration. Specific Gravity at 18°C. of Mixture 
| Mean at 18°C. 
Sp. Gr. 
H Cl. + Hz SO4. tel (Clk + He S04. | 
3.05 2.95 1.0525 1.0912 1.0719 1.0720 
2s L7H 1.0371 1.0549 1.0460 1.0462 
1.02 s 1.0182 Lhe 1.0366 1.0365 
502 “ 1.0091 | « 1.0320 | 1.0319 
Results of the Observations and Calculations of the Conductivity 
of Mixtures. 
Table III contains the results of the observations and the 
calculations, by means of the data given therein, of the con- 
ductivity of mixtures of the acids under consideration, The 
regional concentration k, of the hydrochloric acid may be 
obtained from the value 4, by means of the expression 
Hoy 
ky a Yo» 
where &, is the regional concentration of the sulphuric acid. 
The specific molecular conductivities at infinite dilution have 
the values given above. In this table the conductivities and 
conceutrations are expressed as in Table I. The differences 
between the calculated and observed values of the conductivity 
are given as percentages of observed values. 
