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. 1913 Excerpt: ...and becomes bluish-green. On gentle ignition it is converted into chromic oxide, Cr2Oy Chromic Oxide is a dark green powder which may be ignited strongly without loss of weight. The oxide, after strong ignition, is insoluble in hydrochloric acid. Further information in connection with the determination of chromium will ...
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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. 1913 Excerpt: ...and becomes bluish-green. On gentle ignition it is converted into chromic oxide, Cr2Oy Chromic Oxide is a dark green powder which may be ignited strongly without loss of weight. The oxide, after strong ignition, is insoluble in hydrochloric acid. Further information in connection with the determination of chromium will be found below and on p. 83. CHROMATE AND DICHROMATB. Chromate and dichromate are usually determined volumetrically (p. 83). If the method is practicable, the gravimetric determination as mercurous chromate is easy and accurate. Chromate (or dichromate) may also be determined gravimetrically by reduction to a chromic salt, followed by precipitation as chromic hydroxide (see under Chromium). Forms in which Chromate is precipitated. Mercurous Chromate.--This method is applicable if chloride is present only in small amount. A large quantity of sulphate also renders the method inaccurate. Barium Chromate.--Chloride does not interfere with the use of this method, but sulphate must, of course, be absent. The properties of barium chromate are described on p. 16g. Determination of Chromate as Mercurous Chromate. Outl1ne Of Method.--The chromate is precipitated as mercurous chromate, which on ignition is decomposed, leaving chromic oxide, Cr2C3. Mercurous Chromate.--On addition of mercurous nitrate to a chromate, a brown precipitate of a basic salt separates. This quickly changes to the bright red normal salt, Hg2CrO4. Mercurous chromate is insoluble in water and in very dilute nitric acid. On ignition, it is converted into chromic oxide (for the properties of chromic oxide, see p. 182). If the mercurous chromate is contaminated with much mercurous chloride, the precipitate is bulky and inconvenient, and chromic oxide is lost during the ignition. Proc...
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