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methods in metallurgical analysis

by charles henry white

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...20 cc. Of water. When the iron is all reduced (the solution becoming color- less) and the zinc is all dissolved, transfer the solution to a large IRON IN ORES PERMANGANATE METHOD 57 beaker or white dish, being careful to wash out all of the iron solution from the original beaker, dilute with cold distilled water to about 500 cc. And titrate with standard permanganate solu- tion, stirring, until a faint permanent pink pervades the whole solution. For the method of titrating, reading the burette, and calculating the result, see pages 35 and 39. REDUCTION OF THE IRON BY MEANS OF THE JONES REDUCTOR If many reductions are to be made with zinc, the process is much more quickly carried out by the use of the reductor. This re- ductor * in its simplest form (Fig. 51) consists of a glass tube about 60 cm. In length, the upper half of which has an internal diameter of 25 mm. With a funnel top, and the lower half is drawn down to a diameter of 6 mm. The tube is provided with a glass tap at the...