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

Difficulty 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
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
Immersion probe NiCr-Ni, teflon, 300 °C 13615-05 1,00
Reference electrode, AgCl 18475-00 1,00
Potass.hexacyanoferrate/III/10 30100-10 1,00
Potass.hexacyanoferrate/II/250 30101-25 1,00
Water, distilled 5 l 31246-81 1,00
Spoon, special steel 33398-00 1,00
Wash bottle, plastic, 500 ml 33931-00 1,00
Funnel, glass, top dia. 50 mm 34457-00 2,00
Funnel, glass, top dia. 80 mm 34459-00 2,00
Magnetic stirrer without heating, 3 ltr., 230 V 35761-99 1,00
Beaker, tall form, 150 ml 36003-00 4,00
Burette, lateral stopcock, Schellbach, 50 ml, graduations 0, 1 ml 36513-01 2,00
Volumetric flask 1000ml, IGJ24/29 36552-00 4,00
Volumetric pipette, 50 ml 36581-00 2,00
Pipette dish 36589-00 1,00
Pasteur pipettes, 250 pcs 36590-00 1,00
Pipettor 36592-00 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
Burette clamp, roller mount., 2 pl. 37720-00 1,00
Rubber caps, 10 pcs 39275-03 1,00
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1,00
Platinum electrode in protection tube, d = 8 mm 45206-00 1,00
Holder for two electrodes 45284-01 1,00
Beaker, 100 ml, high-form 46026-00 2,00
Magnetic stirring bar 30 mm, cylindrical 46299-02 1,00
Spring balance holder 03065-20 2,00
Connecting cord, 32 A, 500 mm, black 07361-05 1,00
Adapter, BNC-plug/socket 4 mm 07542-26 1,00
Document     Filesize
p3060962e.pdf Experiment guide, English 341.58 KB

Follow us on
Facebook YouTube
PHYWE - excellence in science
  • 0
  •