If the quantity of water is greater, the
solution may be preserved for some minutes without decomposition. If
the liquid is boiled, it decomposes instantly. At a red heat platinic
fluoride decomposes into metallic platinum and fluorine, which is
evolved in the free state. This reaction can therefore be employed as
a ready means of preparing fluorine, the fluoride only requiring to be
heated rapidly to redness in a platinum tube closed at one end, when
crystallized silicon held at the open end will be found to immediately
take fire in the escaping fluorine. The best mode of obtaining the
fluoride of platinum for this purpose is to heat a bundle of platinum
wires to low redness in the fluorspar reaction tube in a rapid stream
of fluorine. As soon as sufficient fluoride is formed on the wires,
they are transferred to a well stoppered dry glass tube, until
required for the preparation of fluorine.
ACTION OF FLUORINE UPON NON-METALLIC COMPOUNDS.
_Sulphureted Hydrogen._--When the horizontal tube shown in Fig.
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