MIXTCRES OF SULPHURIC ACID AND WATER. 3]() 



XV r. 



Table expressing the Quantities of Sulphuric Acid at 06" 

 [spec. grav. 1'842] contained in Mixtures of this Acid and 

 Water at different Degrees of the Areometer ; by Mr. 

 Vauquelin*. 



il HE use that is made at present of sulphuric acid of ^'''f^'igth of 

 ditferent strengths for various uses, and particularly for the 3" ^\ "J^^ ^' 

 manufacture of soda, has rendered it necessary for the ma- inquiry to ma- 

 nufacturers and consumers of this acid, to inquire into the 

 quantity of concentrated acid, that is, at 66®, indicated by 

 the different degrees of the areometer. 



Concentrated sulphuric acid not being necessary for the Best strength 

 decomposition of muriate of soda, that which is carried to ^"i" ^^^^^o^ipo^ 

 50* in the chamber being- even preferable, both the manu- ^^-^ ^ 

 facturer and consumer would find their advantage in the use 

 of this. But to settle tlie price of this acid, according to 

 the various degrees marked by the areometer, we must 

 know how much acid of 66* there is at each degree, which 

 can be found only by experiment ; the quantities of acid not 

 being in the direct ratio of the degrees, in consequence of 

 the condensation that takes place on the combination of the 

 acid with water. 



Having been very frequently consulted on this subject, I Atabi* of 

 have thought it would be useful, to construct a table by ^jg^j-yf ^ 

 means of experiments, in which the degrees of the areometer 

 should show the weights of acid at 66*. 



For this purpose I began with taking accurately the spe- Method in 

 cific gravity of the sulphuric acid at 66*, which I used in lowTnewL 

 making my mixtures ; and I found it to be 1'842, distilled constructed. 

 water being taken as the unit, at the temperature of 12* of 

 Reaum. [59° F.]« I then sought the quantities of this acid 

 and water necessary to produce the degrees of the areometer 

 used in trade to measure the density of this acid, beginning 

 at 60°, and proceeding downward by fives till I came to 6*. 



The weights were ascertained with great care by means of 

 a very sensible balance : the vessel, in which I made my 

 wixtures, was constructed so that the vapours formed by 

 • Anna de Chim vol, l.XXVI, p 250. 



