Chemicals:
| 4,4'-bis(dimethylamino)fuchsone
| | toluene
| | acetone
| | methanol
| | piperidine | |
| Glass wares: |
| 3 conical measures, graduated, 500 mL
| | 3 glass stirring rods
| | volumetric pipette 3 mL
| | pipette bulb
| | 3 snap-cap vials 10 mL
| | watch glass
| | spatula |
Hazards and safety precautions:
 
|
Methanol may be a reproductive hazard. Ingestion may be fatal. Risk of very serious, irreversible damage if swallowed.
Exposure may cause eye, kidney, heart and liver damage. Chronic or substantial acute exposure may cause serious eye damage,
including blindness.
Toluene is toxic by inhalation, ingestion or by absorption through skin. Serious irritant. Experimental teratogen.
|
 |
Piperidine is a poison. May be fatal if inhaled or swallowed. Severe irritant. Skin contact may cause severe irritation
or burns. Contact with the eyes may lead to permanent damage. |
|
Acetone is highly flammable. Irritating to eyes. |
Safety glasses and protective gloves must be worn. The experiment should be performed under a portable fume cupboard giving
all-round visibility!
Experimental procedure:
Three conical measures are filled with 400 mL of toluol, acetone and methanol, respectively. The solvents are mixed with 3 mL of
piperidine (removal of trace amounts of acid). A "spatula-tip" full of 4,4'-bis(dimethylamino)fuchsone is dissolved in each of the
three different solvents while stirring.
Results:
|
| Solvent
| Color of solution
| | conical measure 1
| toluol
| orange
| | conical measure 2
| acetone
| red
| | conical measure 3
| methanol
| purple |
 Video clip(Download RealPlayer .rm file)
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