COMBINATIONS OF OXALIC ACIO. g7 



ed, or 0*83 of real ammonia. We have therefore for the 

 proportions of dry oxalate of ammonia 



27'6C ammonia. Its component 



62-34 oxalic acid*. P'"«- 



Consequently 100 of ammonia combine with 261*4 oxalic 

 acid. 



1 ascertained the quantity of water contained in crystal- Water in the 

 lized oxalate of ammonia by precipitating it with muriate of "^''^^ ^* 

 lime, and found it was 13 in 100. 



I likewise employed neutralization by ammonia to fi/id 

 the excess of acid in the superoxalates: and I found tlie re- 

 sults analogous to those I have already given. 



Thus, after having found by calcination, that 10 gr. of 

 superoxalate of potash contained 3*46 of potash; I found, 

 that it required 1*254 of real ammonia, to bring them to the 

 neutral state. The quantity of acid of the superoxalate of 

 potash therefore is 3*32 gr. neutralized by the potash in it, 

 added to 3*28 neutralized by the ammonia. This result, 

 extremely near what I have given, proves, that the excess of 

 acid of the superoxalate is equal to that which is neutralized 

 by the potash in the salt. 



Superoxalate of ammonia. 



The superoxalate of ammonia too is less soluble than the Superoxalate 

 neuUal oxalate. ^ of ammonia. 



10 gr. of this salt yielded 11*84 of oxalate of lime — 

 7'34 of oxalic acid ; a quantity capable of neutralizing 2*81 

 of ammonia. If then the alkali in the superoxalate of am- 

 monia were combined with twice as much acid as in the neu- 

 tral oxalate, the quantity of ammonia, necessary to bring 

 the salt in question to the neutral state, must be 1*4. Now 

 I found it by experiment to be \'^5. 



* 1 have giveu the figures here as they stand in the original j but, as 

 Uiere was evidently some mistake, the amount being only 90, 1 endea- 

 voured to find where the errour lay. From what follows, combined with 

 the proportion of real acid before assigned to the cryitallized acid by the 

 author, it appears, that the 5 in the beginning of the paragraph should 

 have been a S; and the proportions, 2766 ammonia to 72*34 oxalic 

 acid J or lOO'amraonia tc 261*53 acid, C' 



We 



