Methods of the Chemists Committee of the United States Steel Corporation for Th
Methods of the Chemists Committee of the United States Steel Corporation for Th
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Of cold water are added and, after stirring, the solution is filtered through an 11 cm. Filter paper and the filtrate is retained in a 16 ounce flask. The residue on the filter paper is washed with cold 2 per cent nitric acid until the iron solution is completely removed.
To the filtrate, with a volume of not more than 150 cc. , 25 cc. Of ammonia water (. 90 sp. Gr. ) are added, and the flask is shaken until the precipitate coagulates. Twenty-five cc. Of concentrated nitric acid, which should b...e sufficient to dissolve the precipitate and allow an excess of 7 to 10 cc. , are added. The comparatively large amounts of nitric acid and ammonia are required only when 4 to 5 grams of the sample are used and insure the presence of a sufficient quantity of ammonium nitrate which, together with the excess of nitric acid, is essential for the precipitation of pure crystalline ammonium phosphomolybdate. When smaller quantities of the sample are used, the amount of ammonia may be decreased, but there should always be an excess of nitric acid as prescribed.
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To quickly assess the difficulty of the text, read a short excerpt:
Of cold water are added and, after stirring, the solution is filtered through an 11 cm. Filter paper and the filtrate is retained in a 16 ounce flask. The residue on the filter paper is washed with cold 2 per cent nitric acid until the iron solution is completely removed.
To the filtrate, with a volume of not more than 150 cc. , 25 cc. Of ammonia water (. 90 sp. Gr. ) are added, and the flask is shaken until the precipitate coagulates. Twenty-five cc. Of concentrated nitric acid, which should b...e sufficient to dissolve the precipitate and allow an excess of 7 to 10 cc. , are added. The comparatively large amounts of nitric acid and ammonia are required only when 4 to 5 grams of the sample are used and insure the presence of a sufficient quantity of ammonium nitrate which, together with the excess of nitric acid, is essential for the precipitation of pure crystalline ammonium phosphomolybdate. When smaller quantities of the sample are used, the amount of ammonia may be decreased, but there should always be an excess of nitric acid as prescribed.
What to read after Methods of the Chemists Committee of the United States Steel Corporation for Th?
You can find similar books in the "Read Also" column, or choose other free books by United States Steel Corporation to read onlineMoreLess
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