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.
What you can learn about
- Cryoscopic constant
- Freezing point depression
- Molar mass
Necessary accessories
- Precision balance 620g/0.001g
Scope of Supply
Device Name | Item no. | Qty |
---|
Beaker, Borosilicate, low form, 1000 ml | 46057-00 | 1,00 |
Mortar with pestle, 150 ml, porcelain | 32604-00 | 1,00 |
Protective sleeves f.temp.probe,2 | 11762-05 | 1,00 |
Magnetic stirring bar 30 mm, cylindrical | 46299-02 | 1,00 |
Universal clamp | 37715-00 | 1,00 |
Desiccator, vacuum, diam. 150 mm | 34126-00 | 1,00 |
Denaturated alcohol (spirit for burning), 1000 ml | 31150-70 | 1,00 |
Magnetic stirrer with heater MR Hei-Standard | 35751-93 | 1,00 |
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. | 45019-25 | 1,00 |
Pipettor | 36592-00 | 1,00 |
Microspoon, steel | 33393-00 | 1,00 |
PHYWE Temperature meter digital, 4-2 | 13617-93 | 1,00 |
Magnetic stirring bar, 50 mm, cylindrical | 46299-03 | 1,00 |
Rubber caps, 10 pcs | 39275-03 | 1,00 |
Watch glass, dia.80mm | 34572-00 | 1,00 |
Sheath Thermocouple, NiCr-Ni, Type K, -40°C ... +1000°C | 13615-06 | 1,00 |
Apparatus for freezing point depression | 36821-00 | 1,00 |
Dish, plastic, 150x150x65 mm | 33928-00 | 1,00 |
Urea, 250 g | 30086-25 | 1,00 |
Supp.rod stainl.st.,50cm,M10-thr. | 02022-20 | 1,00 |
Glass rod,boro 3.3,l=300mm, d=7mm | 40485-05 | 1,00 |
Volumetric pipette, 50 ml | 36581-00 | 1,00 |
Porcelain plate f.desiccator150mm | 32474-00 | 1,00 |
Magnetic stirring bar 15 mm, cylindrical | 46299-01 | 1,00 |
Right angle boss-head clamp | 37697-00 | 1,00 |
Wash bottle, plastic, 500 ml | 33931-00 | 1,00 |
Hydroquinone 250 g | 30089-25 | 1,00 |
Pellet press for calorimeter | 04403-04 | 1,00 |
Gasket for GL25, 12mm hole, 10pcs | 41243-03 | 1,00 |
Pasteur pipettes, 250 pcs | 36590-00 | 1,00 |
Universal power supply600mA 3V/ 4,5V/ 5V/ 6V/ 7,5V/ 9V/ 12V incl. 8 adaptors | 11078-99 | 1,00 |
Water, distilled 5 l | 31246-81 | 1,00 |
Necessary accessories