Determination of molar masses via a measurement of the freezing point depression (cryoscopy)
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Principle In order to train and demonstrate the determination of molar
masses by way of a measurement of the freezing-point depression,
urea or hydroquinone are used as test substances. The cryoscopic
constant of water is determined from the freezing point
depression. Benefits - With detailed experiment guide
- Compact, easily transportable setup
- Simultaneous display of current temperature and temperature difference
Tasks - Determine the freezing point depression of water dissolving
different amounts of hydroquinone and urea.
- Calculate the cryoscopic constant from the experimental
results.
Learning objectives - Cryoscopic constant
- Freezing point depression
- Molar mass
Necessary accessories - Precision balance 620g/0.001g
Scope of delivery |
Right angle boss-head clamp
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37697-00
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1
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Universal clamp
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37715-01
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1
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Supp.rod stainl.st.,50cm,M10-thr.
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02022-20
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1
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Apparatus for freezing point depression
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36821-00
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1
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Temperature meter digital, 4-2
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13618-00
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1
| |
Sheath Thermocouple, NiCr-Ni, Type K, -40°C ... +1000°C
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13615-06
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1
| |
Protective sleeves f.temp.probe,2
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11762-05
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1
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Gasket for GL25, 12mm hole, 10pcs
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41243-03
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1
| |
Magnetic stirring bar 15 mm, cylindrical
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46299-01
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1
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Magnetic stirring bar 30 mm, cylindrical
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46299-02
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1
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Magnetic stirring bar, 50 mm, cylindrical
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46299-03
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1
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Dish, plastic, 150x150x65 mm
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33928-00
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1
| |
Beakers, Boro, low form, various sizes
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46057-00
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1
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Bulb pipettes, various sizes
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36581-00
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1
| |
Pipettor
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36592-00
|
1
| |
Glass rod,boro 3.3,l=300mm, d=7mm
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40485-05
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1
| |
Pellet press for calorimeter
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04403-04
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1
| |
Mortar with pestle, 150 ml, porcelain
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32604-00
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1
| |
Microspoon, steel
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33393-00
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1
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Wash bottle, plastic, 500 ml
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33931-00
|
1
| |
Weighing dishes, square shape, 84 x 84 x 24 mm, 500 pcs.
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45019-50
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1
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Pasteur pipettes, 250 pcs
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36590-00
|
1
| |
Rubber caps, 10 pcs
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39275-03
|
1
| |
Exsicator, DURAN®
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34130-00
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1
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Porcelain plate f.desiccator150mm
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32474-00
|
1
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Watch glass bowls, various sizes
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34572-00
|
1
| |
Denaturated alcohol (spirit for burning), 1000 ml
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31150-70
|
1
| |
Urea, 250 g
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30086-25
|
1
| |
Hydroquinone 250 g
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30089-25
|
1
| |
Sodium chloride, 500 g
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30155-50
|
1
| |
Universal power supply, 600mA 3/4.5/5/6/7.5/9/12V, incl. 9 adaptors
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11078-99
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1
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Service
