Illustrations. Ignite before the Bp. on Ch. the following oxides,—allow to cool, add a drop of Co(NO3)2, re-ignite, and note color,—aluminum, magnesium, zinc, and calcium.
Care should be taken to thoroughly ignite before adding the cobalt nitrate solution.
With the six methods of examination just given almost every simple substance can be detected, but should any doubt remain, a few simple tests in the "liquid way" will be sufficient to substantiate the blowpipe examination.
CHAPTER III
GENERAL REACTIONS FOR THE DETECTION OF THE METALLIC ELEMENTS IN SIMPLE COMPOUNDS
For the sake of convenience, rather than for scientific reasons, the following compounds have been arranged in alphabetic order. Also the oxides of the elements have been taken, since they exhibit the reactions to best advantage.
The student should work through carefully each one of the tests and satisfy himself as to the characteristic reactions of the various elements, for only in this way can he expect to recognize the substances when presented to him as "unknowns." It is advisable to provide a note-book and rule it as follows:—
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Behavior of Substance |
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Before Bp.| Before Bp. | In ignition | In flame| In flame | After first |
on Ch. | on Ch. with | tube with | on | with borax| ignition |
alone | Na2CO3 | Na2CO3 | platinum| bead | with |
| | and Ch. | wire | | Co(NO3)2 |
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Remarks _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
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Substance _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
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