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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 8

2. Sodium hydrate method (2)
This method is practically the same as the foregoing and is subject to the same sources of errors. The caustic alkali should be present in sufficient excess to cause the solution of the aluminum hydrate and to overcome the action of the air, [illegible]. In this case the quantity in excess is not sufficient to cause any great action upon the glass but it is best to filter into the hydrochloric acid.
As it is difficult to get chemically pure sodium hydrate, potassium hydrate is used in most cases. A good substitute for the sodium hydrate is the sodium peroxide as this can easily be obtained chemically pure.
3. Barium hydrate method (3)
This method differs slightly from the other two in the latter part of the separation. The solution of iron and aluminum salts is added gradually and with constant stirring to the hot solution of the barium hydrate. The whole solution is boiled for some time and the precipitate filtered and washed with hot water and dissolved in dilute

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2. Sodium hydrate method (2) This method is practically the same as the foregoing and is subject to the same sources of errors. The caustic alkali should be present in sufficient excess to cause the solution of the aluminum hydrate and to overcome the action of the air, [illegible]. In this case the quantity in excess is not sufficient to cause any great action upon the glass but it is best to filter into the hydrochloric acid. As it is difficult to get chemically pure sodium hydrate, potassium hydrate is used in most cases. A good substitute for the sodium hydrate is the sodium peroxide as this can easily be obtained chemically pure. 3. Barium hydrate method (3) This method differs slightly from the other two in the latter part of the separation. The solution of iron and aluminum salts is added gradually and with constant stirring to the hot solution of the barium hydrate. The whole solution is boiled for some time and the precipitate filtered and washed with hot water and dissolved in dilute