Mr. Maddrell on the Metaphosphates. 325 



Found. Atom. Reckoned. 

 Per cent. Per cent. 



•853 grm. substance gave -254 NiO =29789 6NiO =29-805 



2-24 , ... -231 NaO, S03= -091 NaO= 4-062 NaO= 4-134 



PO5 estimated as loss = 06-149 7PO5 =66-061 

 100-000 100-000 



Formula, 6(NiO, P05)+NaO, PO5. 



The cobalt salt is a beautiful rose-coloured, anhydrous 

 compound, insoluble in water and dilute acids, but soluble in 

 concentrated sulphuric acid. 



The analysis was made by dissolving it in concentrated 

 sulphuric acid, diluting with water, and precipitating by an 

 excess of ammonia and sulphuret of ammonium. Tiie sul- 

 phuret was then redissolved in nitric acid, and the solution 

 diluted with water, filtered and precipitated by caustic potash. 

 A second quantity was taken for the determination of the 

 soda, and estimated as the preceding salt of nickel. 



Found. Atom. Reckoned. 

 Per cent. 

 1-24 gnn. substance gave -403 C03 O4 =-3755 CoO =30-282 ONiO =29-775 



1-12 -117 NaO, SO3=-051 NaO = 4-358 NaO= 4-136 



PO5 estimated as loss = 65-460 7PO5 =66-089 

 100-000 100-000 



Formula, 6(CoO, P05) + NaO, PO5. 



Thinking I might still obtain tlie pure metaphosphates of 

 nickel and cobalt in the way above mentioned, I prepared a 

 quantity of pure phosphoric acid by the oxidation of phos- 

 phorus with nitric acid, and the process, when tried with the 

 acid prepared in this way, perfectly succeeded. 



By this method I obtained also the metaphosphates of 

 MnO, AI2O3, FcaOa, Cr^Og, CuO, BaO, SrO, CaO, KO, 

 NaO, though not in every case using the sulphates of the 

 bases, as I find that almost any other salt will do equally well. 



Metuphosphate of Oxide of Nickel. — This salt I obtained 

 on adding a solution of sulphate of nickel to an excess of pure 

 phosphoric acid, and by evaporating the mixture in a plati- 

 num vessel until the sulphuric acid had been expelled, then 

 by heating it to upwards of GOO'^ F., when it deposited as a 

 greenish-yellow, anhydrous compound. It is insoluble in 

 water, hydi'ochloric acid and aqua regia, but soluble in con- 

 centrated suljjhuric acid. 



The determination of the nickel was made as the preceding- 

 salt of nickel, and the phosphoric acid estimated from the loss. 



Found. Atom. Reckoned. 

 Per cent. Per cent, 



l-5C5grm. substance gave -537 NiO= 34-401 NiO= 34-485 



POjj as loss = 65-599 PO5 = 65-515 

 100-000 100-000 



Formula, NiO, PO5. 



