SPECIFIC GRAVITY AND DISPLACEMENT OF SOME SALINE SOLUTIONS. 207 



exactly that of crystallisation or equilibrium (T) ; and he must take such m^easures 

 as his experience dictates to ai-rive at this end. Preliminary experiments on a some- 

 ivhat extensive scale are absolutely necessa.ry, and the success of an operation depends 

 almost entirely on the operator and the trouble that he is prepared to take. 



§ 125. Table II. gives for each salt, MR, the temperature, T, of equilibrium between 

 crystals and mother-liquor, and, in condensed form, the experimental data of the 

 determination of S, the specific gravity at T of the mother-liquor, that of water at the 

 same temperature being unity, of m, the concentration of the mother-liquor in gram- 

 molecules salt per 1000 grams of water, and of D^, Dg, D3, the three observed values, as 

 well as D, the finally accepted value, of the specific gravity of the salt, all at T, and 

 referred to that of water at the same temperature as unity. 



Table II. — Experimental Results regarding each Salt in the Ennead. 



Salt ; Formula 



MR 

 Salt : Mol. weight . 

 Temperature, T 



Specific Gravity. 



Weight taken, gms. Wj 

 Displacement, gms. jWg 



Specific gravity, — § = S 



KCl. 



74-6 

 23r 



KBr. 



1191 

 23-4° 



KI. 



166-1 

 24-3° 



EbCl. 



121-0 

 22-9° 



EbBr. 



165-5 

 23-0° 



Rbl. 



212-5 

 24-3° 



CsCl. 



168-5 

 23-1° 



CsBr. 



213-0 



21-4' 



Csl. 



260-0 

 22-8* 



Mother-Ltquor. 



59-4068 

 50-3524 



1-1798 



Concentration. 

 Gm.-mols. p. 1000 gm. H2O, m 4-7619 



Specific Gravity. 



A. Weight of first portion of 



salt, gms. H'jQ . 

 Displacement, gms. w.^^ 



Specific gravity J2=Dj 



B. Weight of both portions of 



salt, gms. Wjg . 

 Displacement, gms. m-,,^, 



Specific gravity — i^ = D„ 



C. Weight of second portion of 



salt, gms. xv^^r, ■ 

 Displacement, gms. w^^ - w^^ 



= ^21 • . . . 



Specific gravity, —^ = D3 



Accepted specific gravity, D 



34 3044 



85-9636 



74-7356 



81-3282 



46-2696 



96-1720 



42-3756 



24-9554 



49-9140 



49-9188 



49-9196 



24-9478 



50-3499 



24-9744 



1-3746 



1-7222 



1-4971 



1-6292 



1-8548 



1-9101 



1-6968 



57250 



8-9344 



7-7670 



6-7229 



8-2307 



12-1563 



5-3057 



78-0087 

 50-3658 



1-5488 



3-5454 



Salt in Crystal. 



13-3684 



36-7928 



27-1751 



19-0112 



27-0906 



26-4777 



22-1229 



27-8926 



7-3271 



13-7498 



8-9703 



7-0256 



8-4700 



7-7248 



5-5671 



6-2453 



1-8245 



2-676 



30295 



2-706 



3-198 



3-428 



3-974 



4-466 



27-4258 



52-5142 



52-1768 



43-7750 



51-5438 



50-6025 



48-7449 



57-5390 



14-5322 



19-6005 



17-1465 



15-9627 



16 0568 



14-7658 



12 2414 



12 9466 



1-887 



2-679 



3043 



(2-74) 



3-210 



3-428 



3-982 



4-455 



14-0574 



15-7214 



25-0017 



(24-76) 



24-4532 



24-1248 



26-6220 



29-6464 



7-2051 



5-8501 



8-1762 



8-9371 



7 5868 



7-0410 



6-6743 



6-7013 



1-951 



2 688 



3-058 



(2-77) 



3-223 



3-426 



3-989 



4-424 



1-951 



2-679 



3-043 



2-706 



3-210 



3-428 



3-982 



4-455 



26-3890 

 5-8545 



4-5075 



53-3916 

 11-8423 



4-5085 



27-0026 



5-9878 

 4-509 



4-508 



