1 62 A Neto Talle of the Quanfiltes of Acid 



common acid, and to take as good a sample cf that kind as 

 I coLiId possibly procure. I have therefore chosen some 

 of my own manufacture, made in the usual way, and con- 

 centrated, as is common in large manufai'tories, by steaminc^ 

 it in a boiler of lead, and finishing it in a retort of glass; 

 When I began the experiment, the atmosphere of the room 

 was at 60°*, and the acid was of the specific gravity of 

 l'84y4, which, at this temperature, is as strong as it is ever 

 sold. 



In order to form the annexed Table, I proceeded as fol- 

 lows : 



I first accurately weighed ten thousand grs, of this acid 

 into a stoppered bottle of glass, and then added to it 100 

 grains of pure water f. When the mixture was become 

 cool, after having been sufficiently agitated, the specific 

 gravity of it was taken, and the result foriris the first line 

 of the Table. In this way I continued to dilute the acid 

 with successive portions of water, taking care to let it rest 

 a sufficient time between each addition of the water, that a 

 complete union between the acid and the water might take 

 place; having found by experiment that a mixture of sul- 

 phuric acid and water, even after it has become cold, re- 

 quires several hours lor it to arrive at the tnaximum of 

 condensation. I took also the precaution of keepinor it in 

 stoppered bottle*, that it might not in)bibe water from the 

 atmosphere, and frequently agitated it during each interval. 

 And, in order to attain as great accuracy as possible, I pro- 

 cured a gravity bottle larger than usual, one that holds 

 nearly ten ounces of water, and with a stem so small that 

 at the part to which the fluid rises when properly filled, a 

 single drop of the liquor will occasion a rise of nearly one 

 Sixteenth of an inch. 



The balance which I made use of in these expcrinifnts, 

 is so delicate that it will turn with the 20lh ]iart of a grain; 

 and as the acidt, will erode the common scale dishes, if 

 dropt upon them, and endanger the accuracy of a result, I 

 have long been in the habit of using those made wrth 

 Wcilgvvnod's ware, and such were eitiployed in making 

 ihis Taljle. Those parts of the Tabic which have a star op- 

 posite to then), were made by actual experiment — the iu- 

 tennediatc ones were the results of calculation. 



• For the (ii/Tercnce wliich is occasioned iji the specific gravity cf ful- 

 phuric 3c!d by change of te.Tipcnilurc, coiiaiilr Nichul^oi-.'s Jcunui,' quarto, 

 vol. iii. pa;.,'C '211. 



t In diluting sulphuric acid, it is usual, and safer, to arid the. .icid by de- 

 grte.- to the w.iter, and not the water to the acid ; but vviih \\m very smal! 

 quantity of water, such caution was not necessary. 



Since 



