A curious reaction also occurs
when fluorine is similarly passed into a 50 per cent. aqueous solution
of hydrofluoric acid itself, a flame being produced in the middle of
the liquid, accompanied by a series of detonations.
_Nitric acid_ vapor reacts with great violence with fluorine, a loud
explosion resulting. If fluorine is passed into the ordinary liquid
acid, each bubble as it enters produces a flame in the liquid.
_Ammonia gas_ is decomposed by fluorine with formation of a yellow
flame, forming hydrofluoric acid and liberating nitrogen. With a
solution of the gas in water, each bubble of fluorine produces an
explosion and flame, as in case of hydriodic acid.
_Phosphoric anhydride_, when heated to low redness, burns with a pale
flame in fluorine, forming a gaseous mixture of fluorides and
oxyfluoride of phosphorus. _Pentachloride and trichloride of
phosphorus_ both react most energetically with fluorine, instantly
producing a brilliant flame, and evolving a mixture of phosphorus
pentafluoride and free chlorine.
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