Speedy Volumetric Determination of Carbonic Acid, 



Fourth. Analysis. 



1st — Volumetric method 3*630 



2nd „.\ „ ,.. 3-670 



Mean ...... 3*650 



By Pettenkofer's method ....... 3*613 



Difference. ..... 0*037 =1*0 per cent. 



Fifth. Analysis. 



1st — Volumetric rn.eth.od 4*478 



2nd „ „ ...... 4-486 



Mean 4*482 



By Pettenkofer's method . . 4*516 



Difference. 0*034=0*75 per cent. 



Sixth Analysis. 



1st — Volumetric method . . . , . . 4*883 

 2nd „ „ 4*930 



Mean 4*906 



By Pettenkofer's method ....... 4*891 



Difference. 0*015=0*3 per cent. 



Seventh Analysis. 



1st— Volumetric method 3*230 



2nd „ „ 3*210 



3rd „ „ 3*217 



Mean 3*219 



By Pettenkofer's method 3*209 



Difference 0'010=0'3 per cent. 



Eighth Analysis. 



Volumetric method 3'266 



By Pettenkofer's method 3*271 



Difference 0*005=0*15 per cent. 



o 2 



