34 J. Y. Buchanan — Specific Gravity of Soluble Salts 



(b) Molecular weight. 



74-6 121-0 168-5 CI 



]19-1 165-5 213-0 Br 



166-1 212-5 260-0 I 



Compartment (a) of Table III contains the formula and com- 

 partment (I?) the molecular weight of each salt. The latter is 

 the fundamental attribute of a substance, on which all its pro- 

 perties depend. The molecular weights of the salts which 

 occur in one column differ by the amount of the difference of 

 the atomic weights of the metalloids which they contain, that 

 .is, by 44*5 or 47. Similarly, contiguous salts in one line have 

 molecular weights which differ by 46*4 or 47*5. If we con- 

 sider the two diagonal triads in the ennead, we see that they 

 are characterized by the fact that both the elements in each 

 unit are different from those in either of the other units. 

 Further, along the diagonal KCl-CsI the molecular weights of 

 the units differ as much as possible from each other, while the 

 atomic weights of the components of each unit are as nearly as 

 possible identical, being close neighbors in the atomic series. 

 On the other diagonal, KI-CsCl, the molecular weights of the 

 units agree with each other as nearly as possible, while the 

 atomic weights of the constituents of the units differ from each 

 other as much as possible. 



(a) 



(6) 



(P) 



(d) 





Table IV. 







The Salt in Crystal. 





K 



Eb Cs 

 Values of T (0°). 





23-4° 



22-9° 23-1° 



CI 



23-4° 



23-0° 21-4° 



Br 



24-3° 



24-3° 22-8° 

 Values of D. 



I 



1-951 



2-706 3-982 



CI 



2-6*79 



3-210 4-455 



Br 



3-043 



3-428 4-508 



. ME 

 values of — — . 



I 



38-233 



44-710 42-310 



CI 



44-460 



51-553 47-820 



Br 



54-580 



61-986 57-670 



T7 i e MR 

 Values or -=— . 



18D 



I 



2-124 



2-489 2-350 



CI 



2-470 



2-864 2-657 



Br 



3-032 



3-444 3-204 



I 



