in the Properties of Solutions. 



475 



sive modifications by altering the initial temperature, and, 

 therefore, rate of cooling of the calorimeter ; but, obviously, 

 the most satisfactory results will be obtained if matters are so 

 adjusted that the figure is chiefly rectilineal, as in the cases 

 here cited. Where, however, the total heat evolved is con- 

 siderable, as it often is, with strong solutions, it is impossible 

 to apply the method with sufficient accuracy to render it of 

 any service. 



The readings in the experiments quoted are given in the 

 following table. 



Readings of the Thermometer taken every half minute during 

 the addition of a 5*5 per-cent. solution of sulphuric acid to 

 water. 



First Experiment. 



Second Experiment. 



173915 



17-3860 



17-3895 



17-5230 



17-3970 



17-2785 d 



17-3910 



17-3860 



17 39 JO d 



17-5180 



17 3940 



17-2755 



17-3890 



17-3865 



17-3900 



17-5130 



17-3905 



17-2720 



17-3875 



17-3865 



17-3900 



17-5090 



17-3865 



17-2690 



17-3865 



17-3870 



173905 



17-5050 



17-3830 



17-2660 



17-3855 



17-3875 



17-3905 



17-5010 



17-3790 



17-2625 



17 3840 



173875 



173905 



17-4965 a 



17-3760 



17-2600 



17-3820 



17 3880 



17 3905 



17-4925 



17-3725 



17-2565 



17 3805 



17-3880 



17-3905 



17-4900 



17-3680 



17-2550 



17-3785 



17-3885 



17-3910 



17-4870 



17-3650 



17-2510 



17-3770 



17-3885 



17-3910 



17-4840 



17-3610 



17-2485 



17-3755 



17-3885 



173910 



17-4810 



17-3570 



17-2455 



17-3740 a 



17 3885 



17-3900 



17-4765 



17-3535 



17-2425 



173723 



17-3885 



17-3900 



17-4735 



17-3500 c 



17-2400 



17-3720 



173890 



17 3890 



17-4700 



17-3460 



17 2360 



173735 



17-3890 



17-3890 



17-4660 



17-3415 



17-2330 



17-3745 



17-3890 c 



17-3885 



17-4620 



17-3380 



17-2315 



17-3755 



173890 



17-3885 



17-4580 



173345 



172285 



17-3765 



17-3890 



17-3885 



17-4545 



17-3310 



17-2260 



173775 



17-3890 



17 3885 



17-4505 



173255 



17-2225 



17-3785 



17-3890 



17-3885 



17-4465 



17-3220 



17-2205 e 



17-3800 



17-3890 



17-3885 e 



17-4425 



17-3185 



17-2170 



17-3810 



17 3890 



17-3880 



17-4390 



17-3155 



17-2140 



17-3815 



17-3890 



17-3875 



17-4360 



17-3115 



17-2115 



17-3825 



17-3890 



17-3865 



17-4320 



17-3075 



17-2070 



17-3835 



17-3890 



17-3850 



17-4285 



17-3040 



172035 



17-3840 



17-3890 



17383J 



17-4255 b 



17-3010 



17-2010 



17-3845 



17-3890 



17-3810 



17-4215 



17-2980 



17-2965 



17-3850 



17-3890 



173790 



17-4175 



17-2950 



17-2930 



17-3850 



17 3890 



17-3770 



17-4130 



17-2910 



17-2890 



17-3855 



17 3890 



17-3755 



17-4085 



17-2870 



17-2855 



17-3855 



17-3895 



17-3730 



17-4050 



17-850 



17-2925 



. 17-3860 b 



17-3895 



173715 



17-4005 



17-820 



17-2895 



17-3860 



17-3895 



17-3700 









17-3860 



17-3895 











Stream of acid started. 

 c, d, e. Composition of the liquid 

 after these readings, 0*112, 0'215, 

 0-327, and 0"418 per cent. H./0 4 

 respectively. 



Stream of acid stopped. 



a. Stream of acid started. 



b, c, d, e. Composition of the liquid 

 after these readings, 0*132, 0'248, 

 0*359, and 0'457 per cent. H.,S0 4 

 respectively. 



5. Stream of acid stopped . 



