COMPOUND SALTS 



1 atom sulphate of nickel y*25 



1 atom sulphate of ammonia 7*125 



7 atoms water 7*875 



24-25 



In this salt the water of crystallization is the 

 same as in sulphate of nickel. The sulphate of 

 ammonia is anhydrous. 



8. Ammonio-sulphate of manganese. This 



sulphate of _}. . , , . 



manganese, salt likewise crystallizes in rhombs, and is very 

 easily obtained by mixing together solutions of 

 the two salts constituting it, in the atomic pro- 

 portions, and concentrating the mixture. Its 

 specific gravity is 1-Q3. Its constituents are as 

 follows : 



] atom sulphate of manganese 9*5 

 1 atom sulphate of ammonia 7*125 

 7 atoms water 7*875 



24-5 



So that the water exceeds by 1 atom the water 

 of crystallization in both the constituents. 



Q. Amiflonio-sulphate of zinc. This salt was 



sulphate of. .. .. . 



zinc. obtained by mixing solutions of the two consti- 

 tuent salts in the atomic proportions, and concen- 

 trating the solution. It crystallizes in fine white 

 rhomboids, which have the peculiar taste of the 

 zinc salts, and dissolve readily in water. The 

 constituents of this salt are as follows : 



