326 Mr. Maddrell on the Metaplwsjjhates. 



Metaphosphate of Oxide of Cobalt was obtained by the same 

 process as the preceding salt of nickel. It is a beautiful rose- 

 coloured, anhydrous compound, insoluble in water and diluted 

 acids, but soluble in concentrated sulphuric acid. 



The analysis was made b^^ dissolving in concentrated sul- 

 phuric acid, diluting with water, and precipitating by an ex- 

 cess of ammonia and sulphuret of ammonium. The sulphuret 

 was redissolved in nitric acid, the solution diluted with water, 

 filtered, and precipitated by caustic potash. The PO^ was 

 estimated from the loss. 



Found. Atom. Reckoned. 

 Per cent. 



•983grm. substance gave -367 €030^ = -342 000= 34-791 CoO= 34-452 



PO5 as loss = 65-209 PO5 = 65-548 

 100-000 100-000 



Formula, CoO, PO5. 



Metaphosphate of Protoxide of Manganese. — This salt was 

 obtained in a similar manner to the preceding salts of nickel 

 and cobalt. It is a white, anhydrous compound, insoluble 

 in water and dilute acids, but soluble in concentrated sul- 

 phuric acid. 



The determination of the manganese was made as in the 

 preceding salt of cobalt, and the POg estimated from the loss. 



Found. At. Reckoned. 



Per cent. Per cent. 



•857 gnn. substance gave -SOeMnO, Mn203=-2847 MnO = 33-22 MnO = 33-321 



PO5 as loss = 66-78 PO5 =66-679 



100-00 100-000 



Formula, MnO, PO5. 



Metaphosphate of Alumina was obtained by dissolving alu- 

 mina in an excess of phosphoric acid, evaporating, and heat- 

 ing up to the same temperature as with the preceding salts. 

 It is a white, anhydrous compound, insoluble in water and 

 concentrated acids. 



The analysis for the determination of alumina was made, 

 according to Berzelius's method, by fusing the salt with 1^ 

 part of silicic acid and 6 parts of carbonate of soda ; and the 

 PO5 estimated from the loss. 



Found. Atom. Reckoned. 

 Per cent. 

 1-253 gim. substance gave"-243 AU 03= 19-392 A]o03= 19-352 

 POsasloss ^ 80-607 SPOj = 80-648 

 100-000 100-000 



Formula, Al^ O3, 3PO5. 



Metaphosphate of Peroxide of Iron. — This salt was obtained 

 on the addition of perchloride of iron to an excess of diluted 

 phosphoric acid, and by evapoi'ating and heating up to the 

 same temperature as before ; it is insoluble in water and di- 

 luted acid, but soluble in concentrated sulphuric acid. 



