If the alcohol content of a wine is determined directly with an alcohol meter (hydrometer), the resulting alcohol content reading is approximately 0% by volume. This is due to the composition of the wine. The effect of the alcohol on the density is cancelled out by other components such as sugars, acids, essential oils, etc.
For this reason, in order to determine alcohol content by density, the alcohol must be separated out by means of distillation prior to the determination. This corresponds to the official method which currently applies for measuring alcohol in wines. First the wine is titrated to neutrality against bromothymol blue. After transfer to the distillation apparatus, two thirds of this wine sample is distilled off into the receiver flask. Subsequently the distillate is filled back up to the original volume again. Now the density is measured with a pycnometer or hydrometer.
| Materiallist (Excerpt) |
Product |
Amount |
|
Cobra3 Display Unit
|
12154-00
|
1
|
|
Heating mantle for roundbottom flask, 250 ml, 230 V,with saftey switch
|
49542-93
|
1
|
|
Frame for complete experiments
|
45500-00
|
1
|
|
Power regulator
|
32288-93
|
1
|
|
Immers. probe NiCr-Ni, teflon, 200°C
|
13615-05
|
2
|
|
Liebig Condenser, with head, GL18/8
|
35795-15
|
1
|
|
Panel f. compl. experim. set-ups
|
45510-00
|
1
|
|
Round bottom flask, 250 ml, 2-neck, GL25/12, GL18/8
|
35843-15
|
1
|
|
Power supply 12V / 2A
|
12151-99
|
1
|
|
Apparatus holder, variable
|
45526-00
|
1
|
|
Clamp on holder
|
02164-00
|
1
|
|
Clamping holder,turnable,18-25mm
|
45521-00
|
1
|
|
Holder for hand-held meters
|
02161-00
|
1
|
|
Data cable RS 232, SUB-D/USB
|
07157-01
|
1
|
|
Rear-cover for compl.-exp. panel
|
45501-00
|
1
|
|
Round bottom flask, 100ml, GL 25/12
|
35841-15
|
1
|
|
Support clamp for small case
|
02043-10
|
1
|
|
Water, distilled 5 l
|
31246-81
|
1
|
|
Clamping holder,18-25mm
|
45520-00
|
2
|
|
Clamp for heating mantle
|
49557-01
|
1
|
|
Tube Coupling, d = 8 mm
|
47521-00
|
2
|
|
G-clamp
|
02014-00
|
2
|
|
Boiling beads, 200 g
|
36937-20
|
1
|
|
Spring plugs, 50 off
|
45530-00
|
1
|
|
Hydrometer, 0.850-1.000, 180 mm
|
38254-02
|
1
|
|
Support rod, stainless steel, l = 250 mm, d = 10 mm
|
02031-00
|
1
|
|
Fixing bands,universal,100 pcs.
|
45535-00
|
1
|
|
Graduated cylinder 100 ml
|
36629-00
|
1
|
|
Funnel, glass, top dia. 80 mm
|
34459-00
|
1
|
|
Wash bottle, plastic, 500 ml
|
33931-00
|
1
|
|
Rubber tubing, i.d. 6 mm
|
39282-00
|
4
|
|
Hose clip, diam. 8-16 mm, 1 pc.
|
40996-02
|
6
|
|
Hose clip f.12-20 diameter tube
|
40995-00
|
1
|
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