f. The test tube containing the
white phosphorus is placed in a
large beaker containing water.
50 mL Beakers
g. The water in the beaker is heated
above the melting point of white
h. White phosphorus droplets are
obtained using a positive displace-
ment pipet. The droplets will form
spherical particles once they are
Figure A1 (cont`d). Procedure for producing white phosphorus particles.
remain liquid below the melting point); thus the water should be cooled well below 44C to
ensure solidification of the white phosphorus.
Upon solidification, the 3-L droplets will maintain a spherical shape; larger droplets will
be ovoid. The particle dimensions may be measured by transferring the particles to a petri
dish containing reagent grade water and measuring with a calipers. Particles should be color-
less and translucent with a lustrous surface. If the particles are exposed to bright light, they
will turn yellow due to the formation of red phosphorus; therefore the particles should be
shielded from direct light while they are measured.
Once measured, particles should be transferred quickly to a bottle containing reagent grade
water and chilled to 4C in the dark.
Particles may be stored at 4C for approximately 48 hr. With time, a dull, white film will
form on the outer surface of each particle due to oxidation by dissolved oxygen in the water.