A dictionary of chemical solubilities; inorganic

9781236238832: A dictionary of chemical solubilities; inorganic

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ... we have an ' intermittent passivity." If a part of a piece of iron is immersed in strong acid, the whole of it is made passive. This is explained by the N0 spreading over the whole surface by capillarity. The passivity ceases when the Fe is placed in dil. acid, after a longer or shorter time, according to the dilution of the acid,--when the acid has sp. gr. = 1-30, after 11 days 1-28 „ 5 „,,,, „ 1-26 „ 32 hours 1-16 „ 12 „ Iron may also be made passive by long standing in N0 gas under pressure. (Varenne, C. R. 90. 998.) Fe is made passive by a coating of Fe304, not by N0. (Schonbein, Pogg. 39. 342.) (Beetz, Pogg. 67. 286.) (Ramann, B. 14. 1430.) Passivity may also be caused by NH4N03 + Aq, ammoniacal AgN03 + Aq, Fe(N03)3, Fe(N03)2, Al(N03)3, Co(N03)2, Ni(N03)2, etc. + Aq instead of HN03 + Aq. (Ramann, B. 14. 1933.) Hardly attacked by either dil. or conc. acids when they are under high pressure. (Cailletet, C. R. 68. 395.) Iron is dissolved by HN03 + Aq, even when very cone., but no gas is evolved and the process is very siow. HN03 + Aq of the following sp. gr. dissolves the following amts. from strips of pure Fe. (Gautier and Charpy, C. R. 113. 1451.) Not attacked by alkalies. Sol. in Na0H + Aq (34 %) when air is blown through the liquid. (Zirnite, Ch. Ztg. 12. 355.) Na0H + Aq attacks iron and steel. (Venator, Dingl. 261. 133.) Na0H + Aq has siight action on Fe between 15 and 100. (Lunge, Dingl. 261. 131.) Presenee of alkalies prevent rusting entirely, and fats and oils greatly hinder it. (Wagner.) Sol. in alkali hydrogen carbonates + Aq. (Berzelius.) Sat. NaCl + Aq has sl. but perceptible action on Fe. NH4Cl + Aq has stronger action than NaCl + Aq. (Lunge.) 100 ccm. H20 containing 0-5 g. NaCl or KCl removed 42 mg. ...

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