1?6 



Tke solution 



preci, 



bj cachonate 



of ammonia. 



The artificial 

 carbonate si- 

 milar to the 

 nau\c. 



ANALYSIS OF SULPHATE OF BARYTE0. 



cent; and a third experiment 21*85 grains. The* mean of 

 these results gives the proportion of carbonic acid in 100 of 

 carbonate of barytes as -2 1*75 grains, a quantity which dif* 

 fers only | of a grain from that obtained by Klaproth, or 

 Clement and Desormes, who make it 32 per cent. 



2. The muriatic solution, containing 100 grains of carbo- 

 nate of barytes, was precipitated by carbonate of ammo- 

 nia. The precipitate, well washed and dried at a heat 

 below ignition, weighed 100*2 grains. 



3. One hundred grains of artificial carbonate of barytes, 

 precipitated from very pure muriate of barytes by carbo- 

 nate of ammonia, and dried at a temperature somewhat be- 

 low ignition, were redissolved in dilute muriatic acid, and 

 the loss of weight carefully ascertained. The experiment 

 repeated afforded the same result as the preceding with 

 the native carbonate, establishing the identity of the two 

 combinations, and proving, that carbonate of barytes bpth 

 native and artificial is composed of 



Carbonic acid •••• 21*75 

 Barytes 78*25 



100 



Nitrate of Barytes, 



One hundred grains of carbonate of barytes, dissolved in 

 nitrous acid, and gradually evaporated to dryness, afforded 

 132 grains of nitrate of barytes. The experiment repeated 

 on larger quantities, with a view to the preparation of this 

 salt for the purposes of analysis, gave precisely the same 

 results. One hundred and thirty-two grains of nitrate of 

 «*f the nitrate, barytes therefore contain 78*25 grains of barytes, the quan- 

 tity contained in 100 of the carbonate; and 100 parts of the 

 nitrate are composed of 



59*3 barytes, 



40*7 acid and water. 



Casbonate of 

 barytes dis- 

 sol Ted in ni- 

 trous acid. 



Composition 



100 



Clement and Desormes obtained; 130 grains of nitrate of 

 bavytes only from 100 of the carbonate, which gives for the 

 composition of nitrate of barytes, 00 barytes, 40 acid and 



water. 



