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Technical data

Determination of the activity coefficient by a conductivity measurement with CobraSMARTsense

Article no: P3060867
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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.

Learning objectives

  • Equivalent conductivity
  • Ion mobility
  • Conductivity
  • Interionic action

Necessary accessories

  • Analytical balance 120g/0.1mg

 

Scope of delivery

Cobra SMARTsense - Conductivity, 0...20000 µS/cm, 0...60°C (Bluetooth) 12922-01 1
Standard solution 1413µS/cm(25°C), 460ml 47070-02 1
Protection sleeve for electrode with a diameter of 12 mm 37651-15 1
Retort stand, h = 750 mm 37694-00 1
Right angle boss-head clamp 37697-00 4
Support rod with hole, stainless steel, 10 cm 02036-01 1
Spring balance holder 03065-20 1
Magnetic stirrer without heating, 3 ltr., 230 V 35761-99 1
Magnetic stirring bar 30 mm, cylindrical 46299-02 1
Volumetric flasks, Boro, various sizes 36550-00 6
Volumetric flasks, Boro, various sizes 36551-00 2
Funnels (glass), Boro, various sizes 34459-00 2
Bulb pipettes, various sizes 36577-00 2
Bulb pipettes, various sizes 36580-00 2
Bulb pipettes, various sizes 36581-00 2
Pipettor 36592-00 1
Pipette dish 36589-00 1
Beakers, Boro, high form, various sizes 46025-00 2
Beakers, Boro, high form, various sizes 46032-00 8
Weighing dishes, square shape, 84 x 84 x 24 mm, 500 pcs. 45019-50 1
Spoon, special steel 33398-00 1
Pasteur pipettes, 250 pcs 36590-00 1
Rubber caps, 10 pcs 39275-03 1
Exsicator, DURAN® 34130-00 1
Porcelain plate f.desiccator150mm 32474-00 1
Crystallising dishes, Boro, various sizes 46243-00 1
Wash bottle, plastic, 500 ml 33931-00 1
Silicon grease Molykote, 50 g 31863-05 1
Silica gel, orange, granular, 500 g 30224-50 1
Potassium chloride 250 g 30098-25 1
Calcium chloride, granul. 250 g 48021-25 1
measureLAB, multi-user license 14580-61 1
 
PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10 – 37079 Göttingen – Germany
www.phywe.com
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