92 



ACCOUNT OF A NEW EUDIOMETER. 



trnte of silver, or of mercury employed hot. The carbonic 

 acid gas is expanded in this process, but on standing over 

 mercury it returns to its original volume. The sulphuretted 

 hidrogen, in this instance, is taken up by the metallic nitrate. 

 Carbonic acid It should be here observed, that theacetite of lead must not 



pose^accSte of be ll8e< *» as the carl:)onic Hci< t g as » even at a high tempera-, 

 lead. ' ture, decomposes it, forming carbonate of lead. 



Whythesolu- The propriety of using the solutions hot will be seen, 

 used hot. G wnen we ^collect, that the carbonic acid gas is soluble in the 

 water of solution at the common temperature of all these 

 compounds. 

 Nitrous gas and Nitrous gas, and carbonic acid gas, may be separated by 

 carbonic acid means of the hot solution of the green sulphate of iron. To 

 effect this, heat a solution on a glass capsule over a spirit lamp 

 until ebullition. Having filled the measure with the com- 

 pound gas, charge the elastic bottle with the hot solution, 

 and unite them. The nitrous gas in two or thee injections 

 will be absorbed, changing the colour of the solution, while 

 the carbonic acid gas will be a little rarefied, but no absorp- 

 tion of it will take place. 

 Ga*ses ab- Previous to these experiments on the compound gasses, I 



sorbed by alco- j lad tried geveral Qn tne car b on ic acid, sulphuretted hidro- 



faoj, . . , 



gen, and nitrous gasses in their unmixed states. One hun- 

 dred parts of pure alcohol at the common temperature will 

 absorb 70 parts in volume of carbonic acid, and the same 

 quantity of sulphuretted hidrogen. Alcohol impregnated 

 with the latter precipitates the solutions of the nitrates of 



by nitric acid, lead, silver, and mercury, of a dark brown colour. Nitric 

 acid of the specific gravity 1*4, and also of T25, absorbs 

 carbonic acid gas, without any apparent change in the nitric 

 acid. Sulphuretted hidrogen gas is also absorbed by nitric 

 acid, which occasions a slight milky cloud or precipitate 

 therein. 



and by nitrates. The solutions of nitrates of barytes, strontian, and lime, 

 absorb carbonic acid gas equal to half their volume, without 

 any apparent alteration. 



Solutions of nitrates of barytes, strontian, and lime, also 

 absorb sulphuretted hidrogen gas, equal to T %- of their vo- 

 lume, with a slight change of eoiour; the solutions thus 

 impregnated precipitate solutions of nitrate of mercury and 



•f 



