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The Analytical Separation of Iron and Aluminium by Henry Erdmann Radasch, 1897

The Analytical Separation of Iron and Aluminium by Henry Erdmann Radasch, 1897, Page 35

[page]33[/page]

[underlined]Separation.[/underlined]

     The method given is as follows:--
To the cold neutral or nearly neutral solution of iron and aluminium salts, add an equal volume of 50% acetic acid and an excess of a solution of [?nitrous?]-[?beta?]-naphthol in 50% acetic acid (using about 25cc of acetic acid). Allow the solution to stand 6-8 hours and then filter and wash the precipitate with a little 50% acetic acid and cold water (until no residue is left upon evaporation and ignition of a few drops of the filtrate upon a platinum foil). Mix the precipitate with .5 gram of oxalic acid crystals and ignite, gently at first and finally over a blast lamp. If the oxalic acid is not present the precipitate will puff upon ignition and some material will be lost. Ferric oxide is of a beautiful red color.
     The filtrate is heated to drive off the excess of acetic acid and ammonia added in slight excess and the excess evaporated off. The dark precipitate is washed, ignited and weighed as [?aluminum?]. If the separation has been completed the [?aluminum?] will be pure white.

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[page]33[/page] [underlined]Separation.[/underlined] The method given is as follows:-- To the cold neutral or nearly neutral solution of iron and aluminium salts, add an equal volume of 50% acetic acid and an excess of a solution of [?nitrous?]-[?beta?]-naphthol in 50% acetic acid (using about 25cc of acetic acid). Allow the solution to stand 6-8 hours and then filter and wash the precipitate with a little 50% acetic acid and cold water (until no residue is left upon evaporation and ignition of a few drops of the filtrate upon a platinum foil). Mix the precipitate with .5 gram of oxalic acid crystals and ignite, gently at first and finally over a blast lamp. If the oxalic acid is not present the precipitate will puff upon ignition and some material will be lost. Ferric oxide is of a beautiful red color. The filtrate is heated to drive off the excess of acetic acid and ammonia added in slight excess and the excess evaporated off. The dark precipitate is washed, ignited and weighed as [?aluminum?]. If the separation has been completed the [?aluminum?] will be pure white.