Product details

Conductivity of strong and weak electrolytes with Cobra4

Conductivity of strong and weak electrolytes with Cobra4

Item no.: P3060660

Measurement Type: with a computer, Mobile (Datalogging)
Experiment Type: Teacher Experiment, Laboratory Experiment

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

Principle

It is possible to differentiate between strong and weak electrolytes by measuring their electrical conductance. Strong electrolytes follow Kohlrausch's law, whereas weak electrolytes are described by Ostwald's dilution law. The examination of the concentration dependence of the conductivity allows the molar conductivities of infinitely diluted electrolytes to be determined, and facilitates the calculation of degree of dissociation and the dissociation constants of weak electrolytes.

Benefits

  • With detailed experiment guide
  • Simplified implementation: all pre-settings already prepared
  • Easy evaluation via software

Tasks

  1. Determine the concentration dependence of the electrical conductivity of potassium chloride and acetic acid solutions.
  2. Calculate the molar conductivity using data from the measurements taken and determine the molar conductivity at infinite dilution by extrapolation.
  3. Determine the dissociation constant of acetic acid.

What you can learn about

  • Kohlrausch's law
  • Equivalent conductivity
  • Temperature-dependence of conductivity
  • Ostwald's dilution law

Necessary accessories

  • Precision balance 620g/0.001g

Software included. Computer not provided.

Device Name Item no. Qty
curricuLAB measureLAB, multi-user license 14580-61 1,00
Water, distilled 5 l 31246-81 1,00
Standard solution 1413µS/cm(25°C), 460ml 47070-02 1,00
Retort stand, h = 750 mm 37694-00 1,00
Volumetric flask 1000ml, IGJ24/29 36552-00 6,00
Wash bottle, plastic, 500 ml 33931-00 1,00
Beaker, 250 ml, high-form 46027-00 1,00
Pipette dish 36589-00 1,00
Beaker, tall form, 150 ml 36003-00 2,00
Silicon grease Molykote, 50 g 31863-05 1,00
Cobra4 Wireless/USB-Link incl. USB cable 12601-10 1,00
Acetic acid, 1 M sol., 1000 48127-70 1,00
Right angle boss-head clamp 37697-00 2,00
Volumetric pipette, 1 ml 36575-00 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
Pasteur pipettes, 250 pcs 36590-00 1,00
Volumetric flask 250 ml, IGJ14/23 36550-00 4,00
Porcelain plate f.desiccator150mm 32474-00 1,00
Cobra4 Sensor-Unit Conductivity+ 12632-00 1,00
Support rod with hole, stainless steel, 10 cm 02036-01 1,00
Rubber caps, 10 pcs 39275-03 1,00
Volumetric pipette, 5 ml 36577-00 4,00
Funnel, glass, top dia. 80 mm 34459-00 1,00
Silica gel, orange, granular, 30224-50 1,00
Magnetic stirring bar 15 mm, cylindrical 46299-01 1,00
Pipettor 36592-00 1,00
Volumetric flask 500 ml, IGJ19/26 36551-00 4,00
Spoon, special steel 33398-00 1,00
Holder for sensors with support rod 12680-00 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
Volumetric pipette, 100 ml 36582-00 1,00
Magnetic stirrer without heating, 3 ltr., 230 V 35761-99 1,00
Conductivity temperature probe Pt1000 13701-01 1,00
Document     Filesize
p3060660e.pdf Experiment guide, English 529.77 KB

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