DOUBLE SALTS 

 TABLE IV 



147 



Solubility Curves for Double Salts and the Constituent 



Simple Salts 



These temperature-concentration curves represent on hori- 

 zontal axes at both sides of the vertical temperature axis the 

 composition of solutions saturated with two sulphates and in 

 equilibrium with two solid phases. 



Curve : Solid Phases : 



fA mixture of the two 

 I Simple Salts 



FGandFG 'iNa.,SO l .ioH 2 + 



[ M"S0 4 . 7H 2 



{A mixture of the Double 

 Salt and Glauber s Salt 

 Na 2 M"(S0 4 ) 2 . 4H 2 + 

 Na 2 S0 4 . ioH.,0 

 fA mixture of the Double 



Salt and the Vitriol 

 Na 3 M"(S0 4 ) 2 . 4HX> + 



M"S0 4 . 7H 2 

 MJ and M'J' The pure Double Salt. 



Sodium- /ia.gv\es'ium Sulphate 



MaSO loHo+fVSO 7H0tl-Na M ^OA-4-H0 + l3K0 



* 4 2. 5 a- ' 1 ** 1 s «x 1 2 



Trjjisit,"on Temp tt° Tntwtir»or> In fetvd IZ.-ZS' 



mols. • fl g'S0 4 



T 



mck, .NiSO 



in ,oo m.lj HO janflnlhm '« '<" mols. HO 



GHandG'H'* 



GG' is the Transition Point. 

 MM' is the end point of the Transition 

 Interval. 



Sodium-Zinc SnlpK».te 

 K1S0 10H OrZ*So.7H0*NaZ«(SO).AH0-H3H0 



1*2 A' 1 »■ *2, 2 » 



Tfinsitiem Temjj. S'7' JTVtrtsifion Infer.*] fcy-Zl 



Sodium-Nickel Sulphate 



Na.S0.loHO-eN 1 SO.7H0=N*.Ni/So)-4-H0^l3HO 

 Ti-insifion Temp 1 6- S° Trjmsiti'on Intervals O 



H' 



mols. £"S0 



mols. NaSO 



-~ + T 



in <*0 mols. H O _ tw 100 mots. HO 



n*U JftSO. 



m too mols. HO 



? 



TempefaK^re 



—— ■- r-. 



mols. jVa SO 



in loo mo4s H 



the case of the double acetate of copper and calcium (p. 137), or 

 by a change in state of aggregation, as in the case of astrakanite 

 (p. 142). 



