The Nernst equation

 Product No: P3060901

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.

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



Materiallist (Excerpt) Product Amount
Set of Analytical Balance Sartorius CPA 224S and measure software, 230 V 49221-88 1
Digital pH-meter 13702-93 1
Magnetic stirrer Mini / MST 47334-93 1
Temperature probe Pt-1000 13702-01 1
Reference electrode, AgCl 18475-00 1
Retort stand, h 750 mm 37694-00 2
Burette, lateral stopcock, Schellbach, 50 ml, graduations 0, ml 36513-01 2
Platin.electrode in prot.tube,8mm 45206-00 1
Holder for two electrodes 45284-01 1
Burette clamp, roller mount.,2pl. 37720-00 1
Water, distilled 5 l 31246-81 1
Potass.hexacyanoferrate/II/250 g 30101-25 1
Potass.hexacyanoferrate/III/100g 30100-10 1
Volumetric flask 1000ml, IGJ24/29 36552-00 4
Pipette dish 36589-00 1
Pipettor 36592-00 1
Universal clamp 37715-00 1
Pasteur pipettes, 250 pcs 36590-00 1
Spring balance holder 03065-20 2
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1
Right angle clamp 37697-00 2
Volumetric pipette, 50 ml 36581-00 2
Rubber caps, 10 pcs 39275-03 1
Connecting cord, 32 A, 500 mm, black 07361-05 1
Glass beaker DURAN®,tall, 150 ml 36003-00 4
Glass beaker DURAN®, tall, 100 ml 36002-00 2
Funnel, glass, top dia. 80 mm 34459-00 2
Spoon, special steel 33398-00 1
Funnel, glass, top dia. 55 mm 34457-00 2
Magnetic stirring bar 30 mm, cylindrical 46299-02 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: P3060901

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