On definite Proportions. 8.5 



nioted by the heat of a small lamp : but the fluid was not 

 sufficient for the solution of the salt that was formed. 

 After twelve hours, when no more hubbies were extricated, 

 2'li grammes had been lost. I took the solution with the 

 salt out of the flask, and mixed it, in a dish of platina, with 

 sulphuric acid, when a slight eff^ervcscence again toiik place. 

 The mass was then dried in a gentle heat, and afterwards 

 ignited. It afforded 11'866 gr. of the sulphate. 



b.) Five grammes, heated in a manner precisely similar, 

 lost 1 -08, and aff"orded 3-92 of sulphate of baryta. Hence, 

 for 100 parts of the carbonate, we have 21'6 of carbonic 

 acid, and 1 18'4 of the sulphate. 



c.) Ten grammes of carbonate of baryta were dissolved, 

 in the same apparatus, in diluted muriatic acid, and the 

 solution assisted by such a degree of heat, as the hand could 

 not bear, although it was not made to boil. They aff"orded 

 iJ'l63 gr. of carbonic acid, and 11 '82 of sulphate of baryta. 



d.) Ten grammes of carbonate of barvta, dried in a press, 

 and then ignited, so as to form hard lumps, which were 

 more slowly dissolved, were heated in the same manner 

 with muriatic acid. They lost 2*163 gr. and gave !1'86 

 of sulphate of baryta. 



e.) The same (|uantity was dissolved in sulphuric acid, 

 mixed with a little nmriatic acid, in a glass flask, then dried 

 and ignited in the same vessel. It afforded irSQgr. of 

 sulphate of baryta. 



f.) Ten grammes of carbonate of baryta were dissolved 

 in muriatic acid in a glass flask, precipitated with sulphuric 

 acid, evaporated, and ignited in the flask. They gave 1 l-Q 

 gr. of sulphate of barvta. A stront'^er heat expelled no- 

 thing more from this compound. The acids which 1 have 

 eniploved were always so pure as to leave no »pot on a 

 watch glass from which they were made to evaporate. 



In these experiments, therefore, 100 parts uf carbonate 



rf baryta had afforded at least 2P6 of Crirbomc ac-id ; ten 



thousandths can never be appreciated in experiments of 



this kind. We mav therefore assume, for the carbonate. 



Carbonic acid 21 '6 )()0 



Baryta 784 363 



Since 100 parts of the carbonate of baryta, which con- 

 tain nearly 784 of the base, give Ironi 118 6 lo*liy of 

 sulphate of baryta, this tomp<!imd must cnsist of 33-96 

 to 34-1 of acid, with 66-01 to 63-9 of base, and 100 parts 

 of the acid must require 19.VO i:> 194 5 ot baryta. Since 

 in the present state of these experiments an en or of -0005 



Fa is 



