SPECIFIC GRAVITY AND DISPLACEMENT OF SOME SALINE SOLUTIONS. 205 



Table I. — Experimental Details in the case of Caesium Chloride. 



Formula and molecular weight of salt 



Temperature ........ 



Mother-Liquor. 



Determination of Specific Gravity. 



Weight of specific gravity bottle .... 

 Weight of specific gravity bottle filled with distilled water 

 Weight of water which fills it, w^-w-^ 

 Weight of sp. gr. bottle + mother-liquor 

 Weight of mother-liquor, w^-w-^ 



Specific gravity of mother-liquor, — . 



Analysis. 



Weight of mother-liquor taken ........ 



Cb. cents, ^jy -A-gNOg solution used ....... 



Weight of salt equivalent to silver used, ^ .... 



Weight of water in W gms. mother-liquor, Wg - tv^ . 



Concentration of mother-liquor expressed in gm. -molecules salt per 



thousand gms. water, 0*1— '^ . . . . - . 



Salt in Crystal. 



Determination of Specific Gravity. 



A. Weight of first portion of salt 



Weight of sp. gr. bottle + salt + mother-liquor 

 Weight of mother-liquor, w-^-^ - (wj + Wjq) 



Weight of water displaced by mother-liquor 

 Weight of water displaced by salt, w^ - Wjg 



W-, 



•^12 



Specific gravity of salt, -^ . 



B. Weight of second portion of salt . 



Sum of weights of the two portions, w-^q + w^^ 



Weight of sp. gr. bottle -1- salt + mother-liquor 



Weight of mother-liquor, w^^- (wi + w^^) 



w 

 Weight of water displaced by the mother-liquor, -^ 



Weight of water displaced by the salt, Wg - w^^ 



Specific gravity of salt, -^^ .... 



C. Weight of water displaced by salt, Wgj - w^^ . 

 Specific gravity of salt, — ^ . 



Accepted specific gravity of salt 



ME 

 T 





tV- 



13 



Di 



*<'is 



w. 



19 



D„ 



I>3 

 D 



CsCl = 168-5 



23-r c. 



38-8900 gms. 

 89-2399 „ 

 50-3499 „ 

 135-0620 „ 

 96-1720 „ 



1-9101 



1-0334 gms. 

 41-21 c.c. 



0-6944 gms. 

 0-3390 „ 



12-1563 



22-1229 gms. 

 U6-5514 „ 

 85-5385 „ 



44-7828 „ 



5-5671 „ 



3-9739 



26-6220 gms. 

 48-7449 „ 

 160-4249 „ 

 72-7900 „ 



38-1085 „ 

 12-2414 „ 



3-9820 



6-6743 gms. 



3-9890 



3-982 



For weighing out the salt and passing it directly into the specific gravity bottle a 

 special and convenient form of weighing tube was used. It was made out of a stoppered 

 specimen tube with an internal diameter of 2 centimetres and a length of 7 or 8 centi- 

 metres. The lower end of this tube was opened and a piece of narrower glass tube 

 joined to it before the blowpipe. This tube, which had a length of about 3 centimetres, 

 had an external diameter such that it could just pass freely through the neck of the 



