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The ammonia test

The ammonia test

C029/0941

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Credit

MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY

Caption

The ammonia test. There is no visible vapour from the ammonia in the test tube until a glass stirrer dipped in hydrochloric acid is put close by. As the vapours combine a visible smoke of ammonium hydroxide is formed. A droplet of hydrochloric acid has fallen into the tube and vaporised into a doughnut cloud.

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