296 Prof. Muspratt and Mr. J. Danson on Carmuf elite Acid. 



I. 0-456 grm. of substance gave 0-575 grm. of carbonic acid 

 =0-156 grm. of carbon = 34-210 per cent., and 0-198 grm. 

 of water = -022 grm. of hydiogen = 4-824 per cent. 



II. 0-420 grm. of substance gave 0-528 grm. of carbonic acid 

 =0-1440 grm. of carbon = 34-285 per cent., and 0-182 grm. 

 of water =-0202 grm. of hydrogen = 4*809 per cent., which 

 corresponds with the formula 



C24H20O32. 



Centesimally represented. 

 Found. 



24 equivs. of Carbon . 

 20 ... Hydrogen 

 32 ... Oxygen . 



1 ... Acid . . 420 100-000 100-000 100-000 



We found the greatest difficulty at first in preparing the salts 

 of this acid ; e. y. if we added the acid to nitrate of baryta, a 

 jelly was the result j but this could not be dried on bibulous 

 paper, as it adhered so persistently that it was impossible to 

 scrape the salt from it. Our only resource was to prepare the 

 salt fi*om the acetates, taking atomic proportions. 



Carmufellate of Baryta. 



Dissolved equivalent proportions of acid and acetate of baryta 

 in water, mixed the solutions and evaporated to dryness in a 

 water-bath; washed the residue vrith water, and dried on a 

 porous tile over sulphuric acid under a bell-jar. It is slightly 

 soluble in water, but dissolves copiously in nitric and hydro- 

 chloric acids. 



Analysis of the Salt. 

 0-2950 grm. of salt gave 0-0710 grm. of sulphate of baryta 

 =0-0466 grm. of baryta =15-796 per cent. 



Centesimally represented. 



Theory. Found. 



1 equiv. of Carmufellic acid . . 420 84592 

 1 ... Baryta 76-5 15-408 15'796 



1 ... Carmufellate of baryta 496*5 100000 

 Formula BaO,C«4H2o 082. 



Carmufellate of Lead, 

 This salt was similarly prepared to the baryta one. It is 

 shghtly soluble in water, soluble in nitric acid. 



