You need a 50 mL beaker half full with distilled water, a Bunsen burner, a sample ground to a very f

1
Wear your safety goggles!
Wear your safety goggles!
Wear your safety goggles!!
Wear your safety goggles!!
Wear your safety goggles!
Wear your safety goggles!!
2
You need a 50 mL beaker half full with distilled
water, a Bunsen burner, a sample ground to a very
fine powder, and a clean DRY 3-inch test tube
held in a test tube holder.

• Be sure the beaker of water is placed well back
  under your hood.

3
With a paper towel, blot dry a small piece of
sodium and place it into the test tube.

• Over a low flame, heat the sodium until it melts
  into a shiny, silvery ball.

4
Remove the tube from the flame and add a bit of
the powdered sample. There may be a bit of a
reaction when you do this . . .

• You may re-heat, and add more sample if you wish.

5
Finally, re-heat the tube to a dull red

• Move the tube from side to side to avoid burning
  out the bottom of the tube.

6
When the tube is RED HOT, PLACE (do not DROP) the
tube into the beaker of water. Be sure the tube
is not pointed at you, nor at anyone else at this
time.

• The tube should SHATTER! Expect a rather
  vigorous reaction, -- perhaps with fire and
  smoke.

7
Did I mention that you should
WEAR YOUR SAFETY GOGGLES?
8
Heat the solution to boiling for a few minutes
(Fig. 1). Then, gravity filter (Fig. 2) to
remove broken glass and solid residue.

• The clear filtrate is used to test for sulfur,
  nitrogen, and halogens.

9
Some may prefer to use hot plates
10
Conduct the tests as directed in your lab manual
for sulfur, nitrogen, and halogens.

• When your Lab Instructor approves your tests,
  conduct the sodium fusion tests on the unknowns
  which are provided.

11
nafus-lr.doc LABORATORY REPORT SODIUM
FUSIONS NAME ____________________________________
__Section_________Date_______________ Results
of Sodium Fusion Tests Indicate with "" where
positive but NOTHING where negative.

1. Write the EQUATION for the formation of
the black ppt that confirms the presence of
sulfur. 2. Write the FORMULA for the blue ppt
that confirms the presence of nitrogen (Look up
Prussian Blue). 3. Write the EQUATION for the
formation of the white ppt that confirms the
presence of chloride ions. 4. What results would
you expect in the test for halogens, if a.
sulfur is present, and the acidified filtrate is
NOT boiled long enough? (Consider the
appearance of Ag S2- ? ???) b. nitrogen
is present, and the acidified filtrate is not
boiled long enough? (Consider the
appearance of Ag CN - ? ???) c. the
filtrate was acidified with H2SO4 instead of with
HNO3? (Consider the
appearance of 2Ag SO42 -- ? ???) d.
the filtrate was acidified with HCl instead of
with HNO3?

• Your Laboratory Report Form is due the day on
  which you perform the Sodium Fusions. Be
  prepared to turn it in.