[ALLAN] THE OXALATES OF BISMUTH 47 



The high value found for bismuth and the corresponding low 

 values for oxalic acid and ammonia may be due to imperfect filtering 

 'or to a slight admixture of basic bismuth oxalate. This salt has not 

 been previously described. 



The preparation was then repeated using an ammonium oxala.ta 

 solution saturated at 25° and the double salt obtained at 50° gave 

 3.85 per cent NH^ and was identical with that pre\'iously analyzed. 

 When this solution was cooled to room temperature two kinds of 

 crystals were deposited which under the microscope were identified as 

 this double salt and amjnonium oxalate. 



Bismuth oxalate was dissolved in a 20 per cent solution of potas- 

 sium oxalate and the double salt obtained consisted of small white 

 crystals. After the removal of the bismuth from the solution of the 

 salt in hydrochloric acid the filtrate was evaporated and ignited and 

 the potassium weighed as potassium chloride. 



21 per cent and 23 per cent solutions of potassium oxalate gave 

 the same double salt, but the deposit from a 26 per cent solution, at 

 50°, contained 36.1 per cent 620^ and that from the same solution 

 on cooling from 50° to room temperature contained 51.9 per cent 

 C2O4 and these are probably mixtures of the- double salt and potassium 

 oxalate. Svensson (B, 3, 314 )has described a double salt having the 

 composition Bi^ {OzO^)^ K^C^Qi 2 HoO. 



There is no evidence of the existence of the double salts described 

 by Souchay and Lensson and the substances analyzed by them appear 

 to have been mixtures. 



In this paper three new componds have been described — 3 Bi^O^ 

 2 C2O3, Bi^ {C^O^)^ {NH^\ C^O^ 8 H^O and BL ((7,0 J3 K.C^O^ 9^ 



n.o. 



