. Elements of chemistry ... ces of prussic acidis obtained. The receiver must be keptcold, and also from the light, by beingcovered with a wet cloth. The fumes of this acid are exceed-ingly poisonous, and therefore the lamp furnace should beset in a fire-place during the process, so that they mayescape up the chimney. There is a complicated interchangeof principles which take place in this process, which Scheeleexplains thus. In Prussian blue the prussic acid exists in com-bination with iron. The red oxide of mercury having a strongerattraction for this acid than the iron has, the Prussian blu
. Elements of chemistry ... ces of prussic acidis obtained. The receiver must be keptcold, and also from the light, by beingcovered with a wet cloth. The fumes of this acid are exceed-ingly poisonous, and therefore the lamp furnace should beset in a fire-place during the process, so that they mayescape up the chimney. There is a complicated interchangeof principles which take place in this process, which Scheeleexplains thus. In Prussian blue the prussic acid exists in com-bination with iron. The red oxide of mercury having a strongerattraction for this acid than the iron has, the Prussian blueis decomposed, and a prussiate of mercury is formed, whichis soluble in water. On the addition of the iron filings and sul-phuric acid to this solution, the iron absorbs the oxygen fromthe mercury, which is then precipitated in the metallic form,and at the same instant the iron is thus oxidized, it is dis-solved by the sulphuric acid forming the sulphate of , the prussic acid is liberated, because it does not com-. CD What is said of the poisonous quality of the fumes of this acid, and of theprecautions to avoid them ? Explain carefully the complicated interchangeof chemical principles that takes place by this process. Wh is the appearance of the acid thus obtained 7 PRUSSIC ACID. 217 bine with the metals, but only with their oxides, and as theiron deprives the prussiate of mercury of its oxygen, theprussic acid remains free in the solution of the sulphate ofiron, and being volatile, readily passes over into the receiver,by a gentle heat. 398. The hydrocyanic acid thus obtained, is a perfectlycolorless, limpid fluid, and cannot be distinguished by theeye from distilled water. It has a strong odor, resemblingthat of peach blossoms, and when much diluted has thetaste of bitter almonds. 399. A most deadly Poison.—Prussic acid is the mostactive and powerful of all known poisons. A single dropplaced on the tongue of a dog causes his death in a fewseconds, and a servant g
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