282 Prof. Gr. Wiedemann on the Magnetic 



compounds which arise from oxidation of ammoniacal solutions 

 of cobaltons oxide. The magnetic moments of a series of them, 

 as well as of the comi)Ounds obtained by precipitation from 

 cobaltons salts by nitritesj are obtained from a series of obser- 

 vations in which the dry salts and an acid sohition of ferric 

 chloride were examined in the flat flask. The salts were pre- 

 sented partly by Erdmann, partly by Kllnzel. From these ob- 

 servations it folio vrs^ still retaining the same notation, that: — 



G. M. cc. 



(1) Diamine cobaltic sulpliite (4NII3, 00^63, [ 0-4G89 Co ]4"7 14'8 



ooO,,, Oil„U ) ) 



(2) Triamine cobaltic sulphite (mil,, Go, 0„ Q.g^^g ^^ ^Q-G 26-0 



00O2, -H-g U) J 



(3) Acid pentamine cobaltic sulpliite (IONH3, 1 p.,r.^ k-, cc^.k oq.i 



2Co,03, 6S0„ 9H,0) |U 0151 „ 2J o 161 



(4) Tetramine cobaltic liyposulpbate (8NH3, \Q.2-gr> q.o q.qo 



C02 O3, S^ 0-) } ^ " " 



(5) Diamine cobaltic nitrite and ammonium l^.p-^-^o n ?;o c\ \ 

 nitrite(4NH3,OoA,3NA)+2(NH„NOJ / ^ ^^ '^ » ^ «- ^^ 



(6) Triamine cobaltic nitrite (6NH3, C02 O3, "1 q. . ^ < . 2-04 0.9 



OiN c U3 ) J 



(7) Hoseocobaltammoniuni nitrate (IONH3, "1 ^ onf^o n no r»io 

 Co.,03, 3N,0,) |U-ob5b „ -U-U -0-lJ 



>N,0,) 

 (8) Basic pentamine cobaltic nitrate (2ONH3, 

 2Co,03,5N,0,). 



}o-2914 „ 4-008 0-13 



(9) Oxycobaltammoniumnitrate'(oNH.j, CoO.,, 1 r\ . -or n 07 a 00 



XOo^ H^O) ' ". /^■^^'^'^ ^^ ^'"^^ ^'"^^ 



(10) Purpureocobaltic cliloride (IONII3, Oo^ 1 ^,^^pg — 0-54 —0-40 



(11) LuteWbyitic*cbMde(i2NH3* 0^2*6 0-4925 „ -0-11 -0-10 



(12) Potassiocobaltous nitrite from a neutral! n ^-oq n o ■ in i 



solution (3CoO,3K,0,6N,03,H,0)../^^^'^^'" ^^"^^ ^^ ^ 



(13) Potassiocobaltic nitrite from an acid solu- 1 n o ^ ro o q rt.o 



tion (C02 03,3X30, 6^203,31X2 O)../^'-^"^^^ " ^^ ^'^ 

 ('14)Ammonio-potassio-cobalticnitriterCo.,0.,, 1 n -n^o 00 r> k 



4NH3, il o, 4x^^. 03) .: . r^^^^ " ^'^ ^ ^ 



(15) Ferric chloride up to the higher mark. . 0-1244 Fe 27-8 100 



(16) The same filling only the bulb 0-1022 „ 26-8 100 



(17) Potassio-calcio-cobalt nitrite (CoO, CaO, | ^.g^^Q Co 8-3 9-5 



IV2 O, JNo vJy) .^ .^ J 



(18) Potassio-strontio-cobalt nitrite (CoO, l^^ior >~ f\ n tr 

 ^ ^ SiO,K20,N203) .....'j^'3l35,, rO 9-5 



(19) Potassio-baric cobalt nitrite* (CoO,BaO, ) r* ooio 00 n i 



K, 0, N, O3) ...../ ^■^'^^'^ '5 °'° ^^'^ 



(20) Ferric'chloride ..".....'.'..."."'..''.*.' 0-1226 Fe 30-9 100 



While the three first-mentioned amine salts still preserve a 

 not inconsiderable temporary magnetism, this is very small 

 with the other salts; nay, some of them, as e. g. Nos. 7, 10, 



• The formulae are supposed to represent merely empirically the com- 

 position of the compounds. 



