METHODS OF EXPERIMENTING WITH FLUORINE.
When it is desired to determine the action of fluorine upon a solid
substance, the following method of procedure is adopted. A preliminary
experiment is first made, in order to obtain some idea as to the
degree of energy of the reaction, by bringing a little of the solid,
placed upon the lid of a platinum crucible held in a pair of tongs,
near the mouth of the delivery tube of the preparation apparatus. If a
gaseous or liquid product results, and it is desirable to collect it
for examination, small fragments of the solid are placed in a platinum
tube connected to the delivery tube by flexible platinum tubing or by
a screw joint, and the resulting gas may be collected over water or
mercury, or the liquid condensed in a cooled cylinder of platinum. In
this manner the action of fluorine upon sulphur and iodine has been
studied. If the solid, phosphorus for instance, attacks platinum, or
the temperature of the reaction is sufficiently high to determine the
combination of platinum and fluorine (toward 500 deg.
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