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Sulfuric
acid and hydrogen chloride gas are very corrosive:
Work
in a hood or outdoor. Use gloves, wear googles. TEACHER EXPERIMENT........
wat04 Hydrogen
chloride gas absorbed by water generating a fountain
Materials
Tray, goggles,
gloves, 1 ampoule (5 ml broad) with stopper, 1 ampoule (2 ml) with 2 stoppers,
10 cm infusion tube, 15 cm insulated copper wire (D 0.8 mm), 2 pipette
tips (yellow), scissors, 1 short and 1 long blunted hypodermic needle (0.33
x 12.7 mm and 0.9 x 40 mm), micro spirit burner with stand, sulfuric acid
conc. C, table salt, water, methylated spirit, ampoule (5 ml, broad) totally
full with indicator solution from blue Petunia
petals, matches.
Experiment
1. Cut off 5 mm of the thick
side of the pipette tips and of the hypodermic needles.
2. Pierce the stopper of the 5 ml ampoule
and the stopper of the 2 ml ampoule from downside with these pipette tips.
Cut off 1 cm of the thin ends of the pipette tips.
3. Connect the two pipette tips with the tube.
4. Use the copper wire to make a "test tube holder" for the 5 ml ampoule.
5. Photo 1: Mix a
small packet of salt and 10 drops of conc. sulfuric acid inside this 5-ml
ampoule.
6. Close it with the first
pierced stopper.
7. Photo 2 : Pass the gas into the 2-ml ampoule through the tube
and the second pierced stopper.
8.
Photo 3: Pierce the stopper of
this ampoule by a short blunted hypodermic needle:
This allows air (Luft) to leave.
9. Heat the mixture in the first ampoule.
10. As soon as white clouds appear at the plastic end of the needle,
replace the stopper by the third one.
11. This stopper is pierced from downside
by a long blunted injection needle. Push it in as far as possible.
12. Turn this closed ampoule upside
down, dip the plastic end of its needle into an ampoule full of blue indicator
solution, wait.
Write down your Observations:
Try
to explain them.
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publication: 25.10.2001..........last
modification: 26.06.2010................................................................................................