OF ARTS AND SCIENCES. 141 



The solution saturated at 20° therefore contained the following per- 

 centages of the anhydrous salt: — 



I. n. 



1.07 1.0;; 



Argentic h-Monolrompyromucate, AgC^Hjl^rOo. — The silver salt 

 falls as a crystalline precipitate on the addition of argentic nitrate to 

 an aqueous solution of the free acid. We pi'epared it, however, by 

 precipitating a solution of the potassium salt with argentic nitrate, and 

 recrystallized the product from boiling water. It formed small clus- 

 tered plates sparingly soluble even in boiling water, which could be 

 ■ recrystallized without decomposition from hot water. 



0.2321 grm. of the salt dried over sulphuric acid gave on precipitation 

 with HBr 0.UG5 grm. AgBr. 



Calculated for AgCsIIoBrOa. Found. 



Ag 36.24 36.25 



Sodic Z-Monohrompyromucate, NaC.H^BrOo. — On neutralizing the 

 acid with sodic carbonate we obtained the sodium salt in the form of 

 small radiated needles which proved to be anhydrous. 



I. 0.4172 grm. of the salt gave on ignition with HoSO^ 0.1388 grm. 

 Na,SO,. 

 II. 0.6014 grm. of the salt gave on ignition with H^SO^ 0.1993 grm. 



Na^SO,. 



Na 



Potassic ^-Monohrompijromucate, KCjUgBrOg. — The potassium salt 

 crystallized in irregular flattened prisms which were very soluble in 

 water, and contained no water of crystallization. 



I. 0.3118 grm. of the salt gave on ignition with IIjSO^ 0.1191 grm. 

 II. 0.3384 grm. of the salt gave on ignition with l\^0^ 0.1285 grm. 



Calculated for Found. 



KCjUjUrOa. I. II. 



K 17.07 17.15 17.05 



