320 



MIXTURE OF SULPHUttIC ACID AND WATER, 



the beat evolved in each instance could not escape ; and I 

 was careful not to take the de^^ree on the areometer, till the 

 mixture had returned to IS* K. [59* F.]. 



J reduced to hundredth parts the quantities of water re- 

 quired to obtain the degrees on the areometer, which neces- 

 sarily gaveme fractions. 



It may be objected, that the intervals in nny table are too 

 great; and I confess it would have been better, to make as 

 many mixtures as th« concentrated acid marks degrees on 

 the areometer, namely 6(5: but, not to mention that this 

 would have rendered ray undertaking tedious and difficult, 

 it would not have been of any great use for the purposes of 

 trade, for which it was chiefly intended. In fact, the quan- 

 tity of acid in any degree in these intervals may be obtained 

 very nearly by means of a simple sum in the rule of pro- 

 portion. 



Lastly, I have taken the specific gravity of each of my 

 mixtures, which will give the means of ascertaining the 

 quantity of acid and water in such mixtures, when an areo- 

 meter is not at hand. These specific gravities too will 

 show the degree of condensation, that water experiences, in 

 combining with sulphuric acid in the different proportions 

 employed. 



Table of 



Deg. of 



Specif. 



Sulph. 

 acid 





mixtures of 



Areom. 



gravity. 



at €6°. 



Water. 



sulphuric ac'd 



5 



r023 



6-60 



93-40 



and water. 



10 



1-076 



11-73 



88-27 





15 



1-114 



17-39 



82-61 





20 



1-162 



24-01 



75-99 





25 



1-210 



30-12 



69-88 





30 



1-260 



36-52 



63-48 





35 



1-315 



43-21 



56-79 





40 



1-375 



50-41 



49-59 





45 



1-466 



58-02 



41-98 





50 



1-524 



66-45 



33-55 





55 



1-618 



74-32 



25-68 





60 



1 -725 



84-22 



1578 





Q6 



lb42 







