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The long glass tube should be horizontal. Corks should fit at both ends. Using a pair of tongs
or tweezers, dip a piece of cotton wool into concentrated hydrochloric acid and another
piece into concentrated ammonium hydroxide. Drain off excess liquid. As nearly as possible
at the same time, put the ammonia cotton wool at one end of the tube and the acid cotton
wool at the other. Close the ends of the tube with corks. After a while, look carefully for a
white ring which will form where the ammonia gas and the hydrogen chloride gas meet after
diffusing through the air towards each other. Ammonia is the less dense gas and the white
ring of ammonium chloride should form nearer to the hydrogen chloride end than from the
ammonia end of the tube.
sharon kalunda answered the question on April 12, 2019 at 08:03
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