100 



On the Nature of Solution. 



increase of y — it may be, more than equal to the weakening 

 due to heat ; consequently contraction ensues, tending to de- 

 crease the expansion due to the water. 



Table VI. is partly taken from Kremers's paper, and will 

 show that the above is the case. 



Volume at 20° = 100,000. 



A = difference between the volume of the solution and that 

 of water at the same temperature. 



The strengths are respectively 10 and 40 " salt atoms " to 

 100 parts by weight of water (see Poggendorff's Annalen, 

 xcv., xcvi., xcviii., &c). 







Table VI. 





- 





KC1. 





t°. 



Vol. 10 s. a. 



A. 



Vol. 40 s. a. 



A. 



o 



20 

 40 

 60 

 80 

 100 



100,000 

 100,700 

 101,626 

 102,767 

 104,134 





 +107 

 +110* 

 + 60 

 + 5 



100,000 

 100,807 

 101,727 



102,782 

 103,954 







+214* 

 +211 

 + 87 

 -175 



NaOl. 



20 

 40 

 60 

 80 

 100 



100,000 

 100,730 

 101,673 

 102,826 

 104,187 







+137 

 +157* 

 + 125 



+ 58 



100,000 

 100,895 

 101,880 

 102,983 

 104,213 







+302 

 +364* 



+282 

 + 84 



LiCl. 



20 

 40 

 60 

 80 

 100 



100,000 

 100,613 

 101,480 

 102,565 

 103,866 





 + 20* 

 — 34 

 -136 

 -263 



100,000 

 100,592 

 101,327 

 102,206 

 103,220 





 - 1 

 -189 

 -495 

 -909 



* Point of maximum expansion. 



In conclusion I may point out that, in cases where the same 

 substance exists in more than one form, the variety that is 

 most soluble or is most readily attacked by acids is the one 

 with the least specific gravity. Sulphur forms, I believe, the 

 solitary exception to this rule, which is followed by phos- 

 phorus, arsenic, arsenious oxide, selenium, carbon, and also 

 by that class of compounds of which ferric and aluminic 



