Conductivity titration (with the Cobra3 Chem-Unit)

 Product No: P3060740

Principle

The electric conductivity of aqueous electrolyte solutions is determined by the type and number of charge carriers at constant temperature. Characteristic changes in conductivity are connected with changes in the ionic composition of reacting systems. These can be used in t e conductiometric titration as end point indicators.

Tasks
Using the Cobra3 system, measure the change in conductivity in the titrations of the following:

  • approximately 0.1 molar barium hydroxide solution with 0.1 molar sulphuric acid,
  • approximately 0.1 molarhydrochloric acid with 0.1 molar sodium hydroxide solution and
  • approximately 0.1 molar acetic acid with 0.1 molar sodium hydroxide solution

Other samples can alternatively be set in advance for conductiometric determination of their concentration contents.

What you can learn about

  • Electrolyte
  • Electrical conductance
  • Specific conductance
  • Ion mobility
  • Ion conductivity
  • Conductometry
  • Volumetry



Materiallist (Excerpt) Product Amount
Set of Precision Balance Sartorius CPA 623S and measure software, 230 V 49224-88 1
Cobra3 set pH titration with drop counter, 230 V 43050-88 1
Conductivity temperature probe Pt1000 13701-01 1
Acetic acid, 0.1 M sol., 1000 ml 48126-70 1
Caustic soda sol.,0.1M 1000 ml 48328-70 1
Hydrochloric acid,0.1M 1000 ml 48452-70 1
Water, distilled 5 l 31246-81 1
Barium hydroxide 250 g 30034-25 1
Sulphuric acid,0.5M 1000 ml 48462-70 1
Pipette dish 36589-00 1
Stand.solu.1413æS/cm(25øC), 460ml 47070-02 1
Pipettor 36592-00 1
Volumetric flask 250 ml, IGJ14/23 36550-00 1
Pasteur pipettes, 250 pcs 36590-00 1
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1
Volumetric flask 100 ml, IGJ12/21 36548-00 1
Volumetric flask 50 ml, IGJ12/21 36547-00 1
Rubber caps, 10 pcs 39275-03 1
Funnel, glass, top dia. 80 mm 34459-00 1
Volumetric pipette, 10 ml 36578-00 2
Volumetric pipette, 5 ml 36577-00 3
Spoon, special steel 33398-00 1
Funnel, glass, top dia. 55 mm 34457-00 1
Wash bottle, plastic, 500 ml 33931-00 1
Laboratory Experiments Physics, Chemistry, Biology andApplied Sciences, CD-ROM, incl. operating manuals 16502-42 1

Literature for this article als follows

Title Product Language
TESS expert Handbook Laboratory Experiments Chemistry 16504-12 ENG

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Product No: P3060740

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