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

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

Necessary accessories

Scope of Supply
Device NameItem no.Qty
Beaker, Borosilicate, low form, 1000 ml46057-001,00
Mortar with pestle, 150 ml, porcelain32604-001,00
Protective sleeves f.temp.probe,211762-051,00
Magnetic stirring bar 30 mm, cylindrical46299-021,00
Universal clamp37715-001,00
Desiccator, vacuum, diam. 150 mm34126-001,00
Denaturated alcohol (spirit for burning), 1000 ml31150-701,00
Magnetic stirrer with heater MR Hei-Standard35751-931,00
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs.45019-251,00
Pipettor36592-001,00
Microspoon, steel33393-001,00
PHYWE Temperature meter digital, 4-213617-931,00
Magnetic stirring bar, 50 mm, cylindrical46299-031,00
Rubber caps, 10 pcs39275-031,00
Watch glass, dia.80mm34572-001,00
Sheath Thermocouple, NiCr-Ni, Type K, -40°C ... +1000°C13615-061,00
Apparatus for freezing point depression36821-001,00
Dish, plastic, 150x150x65 mm33928-001,00
Urea, 250 g30086-251,00
Supp.rod stainl.st.,50cm,M10-thr.02022-201,00
Glass rod,boro 3.3,l=300mm, d=7mm40485-051,00
Volumetric pipette, 50 ml36581-001,00
Porcelain plate f.desiccator150mm32474-001,00
Magnetic stirring bar 15 mm, cylindrical46299-011,00
Right angle boss-head clamp37697-001,00
Wash bottle, plastic, 500 ml33931-001,00
Hydroquinone 250 g30089-251,00
Pellet press for calorimeter04403-041,00
Gasket for GL25, 12mm hole, 10pcs41243-031,00
Pasteur pipettes, 250 pcs36590-001,00
Universal power supply600mA 3V/ 4,5V/ 5V/ 6V/ 7,5V/ 9V/ 12V incl. 8 adaptors11078-991,00
Water, distilled 5 l31246-811,00
Necessary accessories
Document  Filesize
11361_01.pdfVersuchsbeschreibung, German471.56 KB
p3022000e.pdfExperiment guide, English216.42 KB