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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 56

[page]54[/page]

[underlined]Separation in a Tartaric Acid Solution.[/underlined][superscript](12)[/superscript]

     To the solution add tartaric acid until no precipitate is given upon the addition of ammonia. Add ammonium sulphide in excess and allow the precipitate to settle and filter it. Wash with water containing a little ammonium sulphide and then with cold water. Dissolve the precipitated sulphide in dilute hydrochloric acid and determine the iron by means of ammonia.
     To the filtrate add sodium phosphate and then hydrochloric acid so that this will be about [?10?]cc of the latter in excess of that required to decompose the ammonium sulphite. Then add 3-5 grams of sodium acetate and boil from 1-2 hours without replacing the evaporated water. Filter and wash the precipitate once with hot water and dissolve in dilute nitric acid. Nearly neutralize this solution with ammonia and add 2-3 drops of phosphoric acid and then 2-3 grams of ammonium acetate. Boil from 1/2-1 hour. Filter and wash this precipitate thoroughly. Dry [?squilt?result?] and weight it as Al[subscript]2[/subscript]O[subscript]3[/subscript]PO[subscript]5[/subscript].
     The separation of the iron is complete.

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[page]54[/page] [underlined]Separation in a Tartaric Acid Solution.[/underlined][superscript](12)[/superscript] To the solution add tartaric acid until no precipitate is given upon the addition of ammonia. Add ammonium sulphide in excess and allow the precipitate to settle and filter it. Wash with water containing a little ammonium sulphide and then with cold water. Dissolve the precipitated sulphide in dilute hydrochloric acid and determine the iron by means of ammonia. To the filtrate add sodium phosphate and then hydrochloric acid so that this will be about [?10?]cc of the latter in excess of that required to decompose the ammonium sulphite. Then add 3-5 grams of sodium acetate and boil from 1-2 hours without replacing the evaporated water. Filter and wash the precipitate once with hot water and dissolve in dilute nitric acid. Nearly neutralize this solution with ammonia and add 2-3 drops of phosphoric acid and then 2-3 grams of ammonium acetate. Boil from 1/2-1 hour. Filter and wash this precipitate thoroughly. Dry [?squilt?result?] and weight it as Al[subscript]2[/subscript]O[subscript]3[/subscript]PO[subscript]5[/subscript]. The separation of the iron is complete.