Cations and anions contribute to charge transport in electrolytic processes in accordance with their different mobilities in an electric field. Hittorf transport numbers characterise the fraction of the total charge transported by a particular ion during electrolysis. They enable the calculation of ionic conductivities, the values of which are important in electrochemical practice. Transport numbers are to be experimentally determined from the characteristic concentration changes which take place at the cathode and the anode during electrolysis.
Determine the Hittorf transport numbers for hydronium and nitrate ions from measurements resulting from the electrolysis of an 0.1 molar nitric acid solution.
| Materiallist (Excerpt) |
Product |
Amount |
|
Set of Precision Balance Sartorius CPA 623S and measure software, 230 V
|
49224-88
|
1
|
|
Power supply, universal
|
13500-93
|
1
|
|
Multi-range meter w.overl.prot.
|
07021-01
|
1
|
|
Digital thermometer, NiCr-Ni, -50...+1300°C
|
07050-00
|
1
|
|
Double U-tube w.frits+cock, GL25
|
44451-00
|
1
|
|
Glass beaker, short, 5000 ml
|
36272-00
|
1
|
|
Retort stand, h 750 mm
|
37694-00
|
3
|
|
Immersion probe NiCr-Ni, steel, -50...400°C
|
13615-03
|
1
|
|
Burette, lateral stopcock, Schellbach, 50 ml, graduations 0, ml
|
36513-01
|
1
|
|
Nitric acid, 1.0 M 1000 ml
|
48448-70
|
1
|
|
Holder for two electrodes
|
45284-01
|
1
|
|
Burette clamp, roller mount.,2pl.
|
37720-00
|
1
|
|
Caustic soda sol.,0.1M 1000 ml
|
48328-70
|
1
|
|
SULFURIC ACID 0.05 MOL/L 1 L
|
31831-70
|
1
|
|
Burette 10ml,strai.stopc.,Schellb
|
47152-01
|
1
|
|
Stopwatch, digital, 1/100 s
|
03071-01
|
1
|
|
Water, distilled 5 l
|
31246-81
|
1
|
|
Methyl red solution (alc.) 50 ml
|
30145-05
|
1
|
|
Volumetric flask 1000ml, IGJ24/29
|
36552-00
|
2
|
|
Copper-II sulphate,cryst. 250 g
|
30126-25
|
1
|
|
Pipette dish
|
36589-00
|
1
|
|
Acetone, chem.pure 250 ml
|
30004-25
|
1
|
|
Graphite electrode,d=7,l=150,6pc
|
44512-00
|
1
|
|
Pipettor
|
36592-00
|
1
|
|
Universal clamp
|
37715-00
|
1
|
|
Contact socket f.bar electrodes
|
45283-00
|
2
|
|
Pasteur pipettes, 250 pcs
|
36590-00
|
1
|
|
Right angle clamp
|
37697-00
|
2
|
|
Volumetric pipette, 50 ml
|
36581-00
|
1
|
|
Connecting cord, 32 A, 750 mm, red
|
07362-01
|
1
|
|
Connecting cord, 32 A, 750 mm, blue
|
07362-04
|
1
|
|
Rubber caps, 10 pcs
|
39275-03
|
1
|
|
Connecting cord, 32 A, 500 mm, blue
|
07361-04
|
2
|
|
Erlenmeyer flask,wide neck,250ml
|
36134-00
|
4
|
|
Glass beaker DURAN®, tall, 100 ml
|
36002-00
|
1
|
|
Glass beaker DURAN®, short , 250 ml
|
36013-00
|
2
|
|
Funnel, glass, top dia. 80 mm
|
34459-00
|
1
|
|
Plate electrode, copper
|
07854-00
|
2
|
|
Lab. pencil, waterproof
|
38711-00
|
1
|
|
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
|
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