Ammonia-hydrogen chloride reaction. White ring (centre) of ammonium chloride particles (white) forming in a glass tube as gases from concentrated ammonia solution and concentrated hydrochloric acid (both diffusing inwards from the plugs of cotton wool) mingle and react. Ammonium chloride is a white solid, while hydrogen chloride and ammonia are colourless gases.

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TOP10392823

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達志影像

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RM

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