A manual of chemistry : containing a condensed view of the present state of the science, with copious references to more extensive treatises, original papers, &c: intended as a text-book for medical schools, colleges, and academies . ese experiments, the acid shouldbe poured out of a bottle, tied to the end of a long stick; otherwisethe operators face and eyes may be severely injured. 4. Nitric acid is decomposed by boiling it with sulphur,which attracts the oxygen and forms sulphuric acid. 5. This acid is also decomposed by metals ; as iron, tin, copper, & various phenomena,
A manual of chemistry : containing a condensed view of the present state of the science, with copious references to more extensive treatises, original papers, &c: intended as a text-book for medical schools, colleges, and academies . ese experiments, the acid shouldbe poured out of a bottle, tied to the end of a long stick; otherwisethe operators face and eyes may be severely injured. 4. Nitric acid is decomposed by boiling it with sulphur,which attracts the oxygen and forms sulphuric acid. 5. This acid is also decomposed by metals ; as iron, tin, copper, & various phenomena, according to the affinity of each metal foroxygen. This may be seen by pouring some strong nitric acid on ironfilings or powdered tin. Violent heat, attended with red fumes, will beproduced and the metals will be oxidized. According to Dumas, whenthe acid has a density of exactly P48, it does not act upon the metals.— Trade de Chim. i. 328. Action of dcutoxide of nitrogen.—When a current of deutoxide ofnitrogen is transmitted through nitric acid, that gas, by taking oxygenfrom the nitric, is converted into the nitrous acid, and a portion ofnitric acid, by losing oxygen, passes into the same compound. The 140 nitrous acid, thus derived from two sources, gives a colour to the nitricacid, the depth and kind of which depend on the strength of the saturating with deutoxide of nitrogen four separate portions ofnitric acid of the densities 1-15, 135, 140, and 150, the colour will beblue in the first, green in the second, yel-low in the third, and brownish-red in thefourth ; and acid of 105 is not eolouredat all. An apparatus such as is herepresented is suitable for exhibiting theseexperiments. Copper turnings must be putinto the bottle with a long funnel, and thenitric acid in the other. After adjustingthe connecting tubes diluted nitric acid ispoured upon the copper through the tubefunnel and the excess of gas may be col-lected over the pneumatic trough. Prepar
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