Dr. Holzmann on some Cerium Compounds. 219 



formula Ce 



2NH 4 



Theory. 



° J3N0 5 + Ce 2 3 ,3N0 5 + 3HO. 



Experiment . 



(1) (2) (3) (4) (5) 



Ce^O* . . 170 2967 2952 2940 29 32 29-43 



2NH*0 . . 52 9-081 N8 , 9 . 55 905 8-91 \ m .„ 



6N0 5 . . 324 56-54/ W iy bi> j M i6 



3HO . . _2_7 4-71 



573 10000 

 On trying to prepare a double salt of the nitrate of the proto- 

 sesquioxide of cerium with nitrate of aniline, the latter was in- 

 stantaneously oxidized, and at the same time a dirty green pre- 

 cipitate was foumed. In this way even a very small quantity of 

 the proto-sesquioxide may be detected; for the liquid, when dilute, 

 directly assumes a red colour. 



The nitrate of the protoxide of cerium seems to form double 

 salts with the nitrates of some of the organic bases, with the in- 

 vestigation of which I am now engaged. 



A mixture of the solutions of protochloride of cerium and. bichlo- 

 ride of platinum, when highly concentrated, deposits on cooling 

 orange-coloured crystals, easily soluble in water and alcohol, but 

 insoluble in ether. They fuse in the water-bath, and are deli- 

 quescent in moist air. An alcoholic solution, when slowly eva- 

 porated over chloride of calcium, often furnishes perfectly deve- 

 loped rectangular prisms. For analysis, the salt was twice recry- 

 stallized from water and dried over caustic lime and chloride of 

 calcium. 



(1) 0-9615 grm., treated with sulphuretted hydrogen, gave, 

 after filtering and igniting the sulphide of platinum, 02375 Pt. 

 The nitrate, boiled aud precipitated with oxalate of ammonium, 

 gave 0-2671 Ce 3 4 . The remaining liquid, when treated with 

 nitrate of silver, gave 1-3485 AgCl. 



(2) 0-782 grm., dissolved in alcohol and mixed with chloride 

 of ammonium, gave after ignition of the ammonio-chloride of 

 platinum 0-1904 Pt. The nitrate, precipitated by oxalate of 

 ammonium, gave 0'22 Ce 3 O 4 . 



(3) 0-6215 grm., treated in the same manner, gave 0-151 Pt, 

 and 0-1724 Ce 3 4 . 



These numbers lead to the formula 



(CeCl) 2 PtCl 2 + 8HO. 



Experiment. 

 Theory. , A — s 



,. 



K 



A 



(1) 



(2) 



(3) 



2Ce . 



. 92 



22-72 



22-55 



22-84 



22-53 



Pt . 



. 99 



24-14 



24-70 



24-35 



24-30 



4C1 . 



. 142 



3506 



34-69 







8110 . 



. 72 



1778 









405 1 00 00 



Q2 



