500 MM. Buusen and Schischkoff^s Chemical 



with excess of hydi-ogen, we have 



«no=C,-30 + C + K. 



Substituting this value in the equation {<^), we have 



«H=V-Ci + 20-f(C + K). 



An analysis of the gases collected in the apparatus, fig. 3, 

 founded upon these considerations, and executed with great care, 

 gave the following results : — 



Absorption Analysis. 



Sulphuretted hydrogen detei-mination in the Potash Ball^. 



146 divisions of the absorption-tube correspond to 30 cubic 

 centims. 



1 bm-ette degree contained « = 0-001243 gnu. iodine. 



The potash ball required ; = l-8 burette degree. 



Hence the sulphuretted hydrogen contained in 97' 104 volumes 

 of gas at 0° C. and l''^ pressure, and absorbed simultaneously 

 with the carbonic acid^ amounted to 



146 

 30 



773 113-5 



1-175 1588-7 



-.0-76«^=0-58 division. 



We obtain from this the following elements necessary for the 

 calculation : — 



* Gasometrische Methoden, by R. Bunsen, p. 93. Roscoe's translation, 

 p. 86. 



