Product details

Nernst equation with Cobra4

Nernst equation with Cobra4

Item no.: P3060962

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

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



Principle

The Nernst equation expresses how the electrical potential of an electrode in contact with a solution of ions depends upon the concentrations (more accurately, activities) of those ions. The equation may be experimentally verified using an electrochemical cell formed from an inert indictator electrode coupled with a convenient reference electrode. The potential of the indicator electrode, and hence the e.m.f. of the cell, is monitored as the ionic composition of the electrolyte solution is changed.

Benefits

  • Relevant both for chemists and for physicists
  • Essential introductory experiment for studying battery technology

Tasks

Using an Ag(S) I AgCl(S) l Cl- reference electrode, measure the potential of a platinum electrode in contant with solutions containing known concentration of the iron(II) and iron(lII) complex ions [Fe(CN)6]4 - and [Fe(CN)6]3-.

What you can learn about

  • Electrode potentials and their concentration dependence
  • Redox electrodes
  • Electrochemical cells

Necessary accessories

  • Analytical balance 120g/0.1mg

Software included. Computer not provided.

Device Name Item no. Qty
Beaker, tall form, 150 ml 36003-00 4,00
Cobra4 Mobile-Link 2 incl. accessories: battery, USB cable, charger and SD memory card 12620-10 1,00
Cobra4 Sensor-Unit Chemistry 12630-00 1,00
Reference electrode, AgCl 18475-00 1,00
Platinum electrode in protection tube, d = 8 mm 45206-00 1,00
Adapter, BNC-plug/socket 4 mm 07542-26 1,00
Immersion probe NiCr-Ni, teflon, 300 °C 13615-05 1,00
Connecting cord, 32 A, 500 mm, black 07361-05 1,00
Magnetic stirrer without heating, 3 ltr., 230 V 35761-99 1,00
Magnetic stirring bar 30 mm, cylindrical 46299-02 1,00
Retort stand, h = 750 mm 37694-00 2,00
Right angle boss-head clamp 37697-00 2,00
Universal clamp 37715-00 1,00
Holder for two electrodes 45284-01 1,00
Spring balance holder 03065-20 2,00
Burette clamp, roller mount., 2 pl. 37720-00 1,00
Burette, lateral stopcock, Schellbach, 50 ml MAU-24022024 2,00
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1,00
Beaker, 100 ml, high-form 46026-00 2,00
Beaker, 150 ml, high-form 46032-00 4,00
Volumetric flask 1000ml, IGJ24/29 36552-00 4,00
Volumetric pipette, 50 ml 36581-00 2,00
Pipettor 36592-00 1,00
Pipette dish 36589-00 1,00
Funnel, glass, top dia. 80 mm 34459-00 2,00
Funnel, glass, top dia. 50 mm 34457-00 2,00
Pasteur pipettes, 250 pcs 36590-00 1,00
Rubber caps, 10 pcs 39275-03 1,00
Spoon, special steel 33398-00 1,00
Wash bottle, plastic, 500 ml 33931-00 1,00
Potass.hexacyanoferrate/II/250 30101-25 1,00
Potass.hexacyanoferrate/III/10 30100-10 1,00
Water, distilled 5 l 31246-81 1,00
Document     Filesize
p3060962e.pdf Experiment guide, English 341.58 KB

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