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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 20

Class III.

1. Nitroso - ß - Naphthol method. (11)

Evaporate the solution to a small bulk and add enough ammonia so that the slight precipitate that forms dissolves upon the addition of a few drops of hydrochloric acid. Add an equal volume of 50 % acetic acid and then the acetic acid solution of the nitroso - ß - Naphthol (50 % acetic acid being used). The precipitation is effected with cold. Stir thoroughly and allow the solution to stand from 4 - 8 hours. Filter and wash the precipitate with 50 % acetic acid and then cold water [?] the filtrate is pale straw colored, [?] residue is left upon evaporation and ignition of a few drops 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. The oxide should be of a beautifiul red color. 
[?] the filtrate to [?] off the excess acetic acid and add ammonia in slight excess. Boil off the excess ammonia and allow the precipitate to settle. Filter & wash thoroughly. [?] and weigh as the

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Class III. 1. Nitroso - ß - Naphthol method. (11) Evaporate the solution to a small bulk and add enough ammonia so that the slight precipitate that forms dissolves upon the addition of a few drops of hydrochloric acid. Add an equal volume of 50 % acetic acid and then the acetic acid solution of the nitroso - ß - Naphthol (50 % acetic acid being used). The precipitation is effected with cold. Stir thoroughly and allow the solution to stand from 4 - 8 hours. Filter and wash the precipitate with 50 % acetic acid and then cold water [?] the filtrate is pale straw colored, [?] residue is left upon evaporation and ignition of a few drops 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. The oxide should be of a beautifiul red color. [?] the filtrate to [?] off the excess acetic acid and add ammonia in slight excess. Boil off the excess ammonia and allow the precipitate to settle. Filter & wash thoroughly. [?] and weigh as the