110 Mixter — Formation of Trisodium Orthophosphate, etc. 



From experiment 1 we have 



5Na a + 2Bi = (Na 0)xBi 2 5 + xNa 2 + 170-6 



Na 2 -f- 50 = 5Na 2 2 + ._. 97'0 



xNa 2 + 2Bi + 50 = ' (Na a O)xBi 9 B + 267*6 



The heat of formation of Bi 2 3 is267'6 c - 131-6° = 136-0. 

 This agrees well with Ditte and Metzner's* result of 137'8 C . 



The fusions of the calorimetric experiments left when 

 treated with water a dull yellow product, which after drying 



Fig. 1. 



360 



320 



ZSO 



ViO 



ZOO- 



/60 



As 



5b 



Bi 



at 100° contained a peroxide of bismuth, water and a little 

 sodium. It yielded on heating about half the weight of oxy- 

 gen required to convert the Bi 2 3 left into Bi 2 5 , that is, only 

 about one-half of the bismuth in the substance was in bis- 

 muthic acid. Several preparations were made by heating a 

 mixture of bismuth trioxide and sodium peroxide, and it was 

 found that the bismuth compound formed gave off oxygen 

 *C. E., cxv, 1303. 



