Preparation of Pyrophoric Iron

Preparation of Pyrophoric Iron. Thoroughly triturate iron(III) oxide in an agate mortar and roast it in a hydrogen stream at 400-500 (see the preceding experiment). Cool the furnace to 100 °G, extract the boat, and spill the iron powder into a heated porcelain bowl. What happens  

Preparation of Iron(II) Oxide, a. First prepare iron(II) oxalate. To do this, pour an ammonium oxalate solution into 20 ml of a Mohr .s salt solution up to the complete precipitation of the iron. Wash the precipitate several times with water by decantation, next filter it on a Buchner funnel, wash off sulphate ions, and dry it at 100 °G. 

When the reaction terminates, cool the apparatus in a stream of carbon dioxide and rapidly spill the product into a small jar preliminarily weighed and filled with carbon dioxide. Close the jar with its stopper and weigh it. Calculate the yield in per cent. What is the colour of the iron(II) oxide What is obtained when iron(II) oxide is roasted in the air When storing a jar with iron(II) oxide, pour paraffin over it. 

Preparation of Macrocrystalline Iron(III) Oxide. Assemble an apparatus for preparing hydrogen chloride. To dry the gas well, install a column with phosphorus(V) oxide in addition to two wash bottles with sulphuric acid. Spill amorphous iron(III) oxide into the middle part of a three-section quartz tube (Fig. 136). Put the latter into a two-zone furnace. To retain the temperature difference, wrap the unheated zone (the middle of the tube) with asbestos. 

Pass a slow stream of thoroughly dried hydrogen chloride through the tube at a rate of one or two bubbles in three seconds during four hours. Gradually raise the temperature in the first zone to 1000 °C, and in the second zone to 800 °C. Do this during two hours, retain the maximum temperature in the furnace for half an hour, and 

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