phate, 



of 



246 SALTS 



residual liquid was not rendered muddy by phos- 

 phate of ammonia or nitrate of lead. But a lit- 

 tle of the phosphate of lead remains in solution, 

 unless the liquid be evaporated to dryness, and 

 the residue dissolved in water. The consequence 

 of this is, that sulphate of soda renders the resi- 

 dual liquid slightly opalescent. 



8. The biphosphate of ammonia is composed 



2 atoms phosphoric acid 7 



1 atom ammonia . . 2-125 



9-125 



9*125 grains of biphosphate of ammonia in crys- 

 tals were just decomposed by 41 '5 grains of ni- 

 trate of lead. Hence, the crystallized salt con- 

 tains no water. This salt forms very beautiful 

 transparent four-sided right prisms with square 

 bases. Taste acid, reddens vegetable blues. 

 Arseniate, 9. Arscniatc of ammonia crystallizes without 

 any great difficulty ; though it has a considera- 

 ble tendency to pass into binarseniate. Its crys- 

 tals are regular octahedrons often with an inter- 

 vening prism between the pyramids. It is an- 

 hydrous, and is composed of 



1 atom arsenic acid 7*75 



1 atom ammonia 2-125 



9-875 



For 9*875 grains are just decomposed by 2O75 

 grains of nitrate of lead. 



