Product details

Determination of the activity coefficient by a conductivity measurement with Cobra4

Determination of the activity coefficient by a conductivity measurement with Cobra4

Item no.: P3060862

Measurement Type: with a computer, Mobile (Datalogging)

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

Principle

The equivalent conductivity of strong electrolytes depends on their concentration. The quotient of the equivalent conductivity at a certain concentration and the equivalent conductivity at infinite dilution is called the conductivity coefficient, which is the result of interionic action.

Benefits

  • Entrance to the world of datalogging by using the Cobra4 Mobile-Link
  • Stable and safe construction due to solid stand material

Tasks

  1. Measure the specific conductivities of various potassium chloride and calcium chloride solutions and calculate the equivalent conductivities.
  2. Determine the equivalent conductivities at infinite dilution using the Kohlrausch equation and calculate the conductivity coefficients.

What you can learn about

  • Equivalent conductivity
  • Ion mobility
  • Conductivity
  • Interionic action

Necessary accessories

  • Analytical balance 120g/0.1mg

 

Device Name Item no. Qty
Porcelain plate f.desiccator150mm 32474-00 1,00
Cobra4 Mobile-Link 2 incl. accessories: battery, USB cable, charger and SD memory card 12620-10 1,00
Support rod with hole, stainless steel, 10 cm 02036-01 1,00
Rubber caps, 10 pcs 39275-03 1,00
Volumetric pipette, 50 ml 36581-00 2,00
Funnel, glass, top dia. 80 mm 34459-00 2,00
Silica gel, orange, granular, 30224-50 1,00
Magnetic stirring bar 30 mm, cylindrical 46299-02 1,00
Protection sleeve for electrode with a diameter of 12 mm 37651-15 1,00
Volumetric flask 500 ml, IGJ19/26 36551-00 2,00
Spoon, special steel 33398-00 1,00
Cobra4 Sensor-Unit Conductivity+ 12632-00 1,00
Spring balance holder 03065-20 1,00
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1,00
Pipette dish 36589-00 1,00
Magnetic stirrer without heating, 3 ltr., 230 V 35761-99 1,00
Standard solution 1413µS/cm(25°C), 460ml 47070-02 1,00
Retort stand, h = 750 mm 37694-00 1,00
Volumetric pipette, 5 ml 36577-00 2,00
Wash bottle, plastic, 500 ml 33931-00 1,00
Conductivity temperature probe Pt1000 13701-01 1,00
Beaker, 50 ml, high-form 46025-00 2,00
Pasteur pipettes, 250 pcs 36590-00 1,00
Beaker, tall form, 150 ml 36003-00 8,00
Silicon grease Molykote, 50 g 31863-05 1,00
Calcium chloride, granul. 250 48021-25 1,00
Right angle boss-head clamp 37697-00 4,00
Volumetric pipette, 25 ml 36580-00 2,00
Desiccator, vacuum, diam. 150 mm 34126-00 1,00
Potassium chloride 25 30098-25 1,00
Cristallizing dish,boro3.3, 300ml 46243-00 1,00
Pipettor 36592-00 1,00
Volumetric flask 250 ml, IGJ14/23 36550-00 6,00
Water, distilled 5 l 31246-81 1,00
Document     Filesize
p3060862e.pdf Experiment guide, English 333.65 KB

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