6 Art. 2.— T. Suzuki: The Change of 



obtained as a rose-coloured llocculent precipitate wliich is very 

 soluble in water and not stable in the air or in solution. Washed 

 with alcohol and dried in a desiccator it was found to have 

 the composition expressed by K6(N02)6Co"Co"2(OH)^, oHjO. 

 The calculated numbers are for this formula, after deducting K0.3 

 and adding in its place H0.3, the salt as prepared showing a de- 

 ficiency of ^V of the six atoms of potassium: — total cobalt, f. 19-56, 

 c. 19-62; cobaltic cobalt, f. 12-82, c. 13-08; potassium, f. 24-73, 

 c. 24-72 ; nitrogen, f. 9-36, c. 9-32. Only in the case of the cobaltic 

 cobalt, and then but slightl}^, do the calculated numbers differ 

 appreciably from the numbers found. 



The empirical formula is remarkable in that it can be bi'oken 

 up into 6KN02 + Co;(OH)s + 5H20. The constitutional formula 

 of the salt is that of a hexa-potassium hydroxy-cobaltous hydroxy- 

 cobaltinitrite : 



/OH OHK 

 (KNO.. NO^eeCo'".,— OH OHCo'OH OHK, 5H,0. 



\ohohk: 



The equation satisfactorily expressing the interaction, so far 

 as it is yet worked out, between a solution of transformed cobalt 

 nitrite and potassium carbonate is the following: 



5Co",Co"'2(NO,)io(OH), + 19K,C0,= 



19CoC03 + 20KNO, + 4K,Co'''2(N02),.,(OH), + K,jCo'Co'',(NO,)o(OH)«. 



But this equation assumes the existence of the simple potassium 

 hydroxycobaltinitrite (KNO2 N02)3Co"'2(OH):., which may be 

 doubted. 



With a dilute solution of silver nitrate the solution of trans- 

 formed cobalt nitrite yields a sLra\v-3'ellow precipitate, which is 

 slightly soluble in water giving it an orange-yellow colour. It is 

 unstable when moist, changing into silver nitrite and basic cobaltic 



