To Procure Hydrogen Gas
Provide a phial with a cork stopper, through which is thrust a piece
of tobacco-pipe. Into the phial put a few pieces of zinc, or small
iron nails; on this pour a mixture, of equal parts of sulphuric acid
(oil of vitriol) and water, previously mixed in a tea-cup, to prevent
accidents. Replace the cork stopper, with a piece of tobacco-pipe in
it; the hydrogen gas will then be liberated through the pipe into a
small steam. Apply the flame of a candle or taper to this steam, and
it will immediately take fire, and burn with a clear flame until all
the hydrogen in the phial be exhausted. In this experiment the zinc or
iron, by the action of the acid, becomes oxygenized, and is dissolved,
thus taking the oxygen from the sulphuric acid and water; the hydrogen
(the other constituent part of the water) is thereby liberated, and
ascends.
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