Product details

Determination of molar masses via a measurement of the freezing point depression (cryoscopy)

Determination of molar masses via a measurement of the freezing point depression (cryoscopy)

Item no.: P3022000
While stocks last

Experiment Type: Teacher Experiment, Laboratory Experiment

Difficulty Expenditure of Time print
  • Description
  • Scope of Supply
  • Accessories
  • Downloads and Documents

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

  1. Determine the freezing point depression of water dissolving different amounts of hydroquinone and urea.
  2. 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

 

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 fo 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

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