30 COMBINATIONS OF OXALIC ACID. 



From thk analysis the elements of oxalate of baryte§ 

 must be 

 lucotnpo- 62-17 barytes, 



nent parts. 37"83 oxalic acid. 



100. 



Whence it follows, that 100 of barytes combine with 

 60*84 of oxaUc acid. 



SuperoxalaU of barytes, 



Suptroxalate When crystals of oxalic acid are boiled in a solotion of 

 muriate of barytes, and the liquor is afterward allowed to 

 cool, crystals are deposited, which are superoxalate of ba- 

 rytes. The formation of this salt was first noticed by 

 Darracq*. 

 Decomposable This combination has so little stability, that boiling the 

 by water. ^^^ j^^ water is sufficient, to deprive it of all its excess of 

 acidf. 



To analyse it, 1 urged in the fire 10 gr. ; and thus found, 

 that they contained 4*504 of barytes. 



I also boiled 10 gr. of the same salt in distilled water, 

 which dissolved out all its [excess of] acid: and 1*102 of 

 real ammonia were necessary, to neutralize the liquid. The 

 acid contained in this salt therefore was 



If» component 2*74 saturated by the barytes \{\ the salt, 



?*"'• 2*80 saturated by ammonia. 



5-50 



Siiperoxalate of barytes, therefore, is composed of 



55 oxalic ac'd 

 45 barytes, 



100. 



And 100 of barytes combine with 123 of oxalic acid. 

 Twiceasmuch Thus we see too, that barytes is combined with twice as 

 riamaVsliU "»"ch acid in the superoxalate, as in the neutral oxalate. 



• Ann. de Chim. vol. XL, p. 69. 



t Thomson'! Systi^m of Chemistry vol, IV 



Oxalate 



