COMBINATIONS OF OXALIC ACID. $3 



10 gr. with ammonia, and precipitated by muriate of lime. 

 Thus I ';Htained 11*73 gr. of oxalate of lime; so that the 

 acid analysed contained 



72"7 of real acid, ^ 



27 -3 water. 



100. 

 As this was to be employed in all my experiments, in 

 order to have it in a uniform state it was powdered, and kept 

 in a well stopped phial. 



Oxalate of potash. 



This salt is so soluble in water, that it la very difficult to Oxalate of 

 crystallize it. 1^°^'^*^^- 



10 gr. v/ere urged in the fire in a crucible, and 6 gr. of Decomposed 

 fused carbonate of potash, insoluble in alcohol, were ob- * 



tained. Now I have observed, that all the carbonates pos- 

 sessing these two properties are uniform in their proportions*: 

 and I have settled the proportion of potash to carbonic acid 

 in this salt to be as 100 to 42'42 : the subcarbonate result- 

 ing from this experiment therefore contained 4*212 gr. of 

 pota^h. 



10 gr. of the same oxalate, precipitated by muriate of by muriate of 

 lime, yielded 6-543 of oxalate of lime. ^'^^' 



The elements of the salt I analysed, therefore, were 



42*12 potash. Its component 



40-57 oxalic acid, P"'". 



17*31 water. 



100. 

 In another experiment, 10 gr. of the oxalic acid, analysed Another 

 above, were accurately neutralized with caustic potash; the 

 oxalate was evaporated to dryness, and exposed to a strong 

 heat in a platina crucible ; and 10*96 gr. of fused subcarbo- 

 aate of potash were the result. 



Taking a mean between these two results, I fix the pro- 

 portions of dry oxalate of potash at 



50*68 potash. Proportions 



49*32 oxalic acid. of the dry 



•xalate. 



100. 

 • Ann. de Chim. tol. LXXI, p. 30. 



Hence 



