150 PROCEEDINGS OP THE AMERICAN ACADEMY 



The solubility of the salt in cold water we determined by precipi- 

 tating the saturated solution withammouic oxalate, and converting the 

 calcic oxalate thus obtained into calcic sulphate by ignition with sul- 

 phuric acid. 



I. 11.3923 grm. of a solution saturated at 20^^ gave 0.0G42 grm. 



CaSO,. 

 11. 11.2016 grm. of a solution saturated at 20° gave 0.0G25 grm. 

 CaSO^. 



The aqueous solution saturated at 20° therefore contained the fol- 

 lowing percentages of the anhydrous salt : — 



I. n. 



1.74 1.72 



Argentic ^-Monohrompyromucate, AgC^H^BrOg. — The silver salt is 

 precipitated by the addition of argentic nitrate to an aqueous solution 

 of the acid. For analysis, we prepared it from the sodium salt by 

 precipitation, and purified it by recrystallization from hot water. 



0.2503 grm. of the salt gave on precipitation with HBr 0.1586 grm. 

 AgBr. 



Calculated for AgCilljBrOj. Founa. 



Ag 36.24 ' 36.41 



Sodic fS-Monohrompyromucale, NaCjHgBrOs. — The sodium salt pre- 

 pared by neutralizing an aqueous solution of the acid with sodic car- 

 bonate crystallized in globular masses and proved to be anhydrous. 



I. 0.4338 grm. of the salt gave on ignition with H^SO^ 0.1470 grm. 

 Na^SO,. 



II. 0.5577 grm. of the salt gave on ignition with H^SO^ 0.1849 grm. 



Na,SO,. 



Calculated for Found. 



NaC5n.,Br03. I- H- 



Na 10^80 10.98 10.74 



Potassic p-Monobrompyromucate, KCgHa^rO.. — On neutralizing 



the acid in aqueous solution with potassic carbonate we obtained the 



potassium salt in the form of flat rectangular plates which proved to 



be anhydrous. 



I. 0.3443 grm. of the salt gave on ignition with H^SO^ 0.1293 grm. 



