Chemical lecture experiments . er, of only a few seconds du-The iron is then carefully with-immersed in water, and then inordinary concentrated nitric acid. Theiron is no longer acted upon by the in the passive state loses its prop-erty of depositing copper from solutionsof copper salts, and, when immersed in asaturated solution of copper nitrate, theiron will retain its original grayish iron should be carefully withdrawnfrom the solution of copper nitrate, and then sharply struckon one edge with a lead-pencil or glass rod. The passivityis destroyed by the blow, and the iro
Chemical lecture experiments . er, of only a few seconds du-The iron is then carefully with-immersed in water, and then inordinary concentrated nitric acid. Theiron is no longer acted upon by the in the passive state loses its prop-erty of depositing copper from solutionsof copper salts, and, when immersed in asaturated solution of copper nitrate, theiron will retain its original grayish iron should be carefully withdrawnfrom the solution of copper nitrate, and then sharply struckon one edge with a lead-pencil or glass rod. The passivityis destroyed by the blow, and the iron is immediatelycovered with a red film of copper precipitated from thesaturated solution of copper nitrate adhering to the a large sheet of iron is used and the blow is care-fully struck, the deposition of copper will proceed from thepoint of contact and rapidly extend all over the surface ofthe iron (Fig. 161). The experiment may be repeated, removing the film ofcopper by immersing the iron in dilute nitric acid. The. Fig. 1(31 IRON 411 iron may be again rendered passive by immersion in fumingnitric acid. The sheet iron may be readily prepared by removing thecoating of tin on a piece of common tinned iron. The tinplate should be immersed in hydrochloric acid until all thetin has been dissolved. Sheet iron cleaned and freed from grease ; Pt wire ; Cu(N03)2;fuming HN03. 3. Carbon in iron. — The carbon in iron may be separatedby dissolving a piece of cast-iron in hydrochloric acid. Theinsoluble carbon will separate as a black powder. The pres-ence of combined carbon as iron carbide gives rise to theformation of hydrocarbons, which are noticeable by the odorthey impart to hydrogen obtained by the action of hydro-chloric acid on iron. Cast-iron ; HC1. 4. Combustion of gunpowder and powdered iron. — The comparative combustibility of gunpowder and iron powdermay be shown by allowing a mixture of equal weights (one-tenth of a gram of each)-to fall from an iron spoon throu
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