424 Action of Nitric Acid on Sebacic Acid. 



Pyrotartrate of silver would correspond with : 



Calculated. 



lAgO 116 6705 



5C 30 17-35 



3H 3 173 



30 24 13-87 



If now the mean amount of oxyd of silver is deducted from 

 the analysis as above, and the equivalents of carbon, hydrogen 

 and oxygen combined with it, calculated on the hundred parts, 

 then we obtain exactly the percentage numbers of the anhy- 

 drous pyrotartaric acid as will be seen from the following 

 comparison. 



Calculated. Found. 



* 



> 



I. II. 



C 5 30 52 63 52-53 52-22 



H 3 3 5-26 5-73 5 60 



3 24 4211 41-74 4218 



C; H 3 3 = 57 100 00 100 00 100-00 



The lead precipitate which results from basic acetate of lead 

 in the ammonia salt of the acid, has been dried and analyzed. 

 (1.) 0-321 grm. substance gave 0*3195 grm. sulphate of lead 

 0-23503 oxyd of lead. 



(2.) 0-4655 grm. substance gave 0*460 sulphate of lead. 

 (3.) 0-3585 grm. substance (of a different preparation) gave 



0*3585 grm. sulphate of lead. 



This amount of oxyd of lead corresponds exactly with the 

 formula : 



C, n H 7 7 + 3PbO=2(PbO, C 5 H 3 3 ) + PbO, HO, as re- 

 sults from the comparison of the found and calculated values. 



llculated. Found. 



A 



I. II. I"' 



3PbO 3351 7312 73-21 72 70 730 



C l0 H 7 O 7 123-0 28-88 



A further comparison of this acid with pyrotartaric acid,, will 

 be possible only, when the latter has been submitted to a more 

 fundamental investigation ; but from the statements above, the 

 identity of these acids can hardly be doubted. 



Lowell, April 4th, 184«J. 





