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Determining the Faraday constant
  1. Fundamentals of electricity
  2. Electromagnetic induction
  3. Electrical machines
  4. DC and AC circuits
  5. Electromagnetic oscillations and waves
  6. Free charge carriers in a vacuum
  7. Electrical conduction in gases

Determining the Faraday constant

VP3.2.5.1
Determining the Faraday constant
Determining the Faraday constant

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Description

In the experiment P3.2.5.1, a specific quantity of hydrogen is produced in an electrolysis apparatus after Hofmann to determine the Faraday constant. The valance of the hydrogen ions is z = 1. The molar mass n of the liberated hydrogen atoms is calculated using the laws of ideal gas on the basis of the volume V of the hydrogen collected at an external pressure p and room temperature T:

At the same time, the electric work W is measured which is expended for electrolysis at a constant voltage U0. The transported charge quantity is then

Components of equipment sets

1 664350 Water electrolysis apparatus LD
1 38235  4  Thermometer, -10...+50 °C/0.1 K LD
1 531832 Digital multimeter P LD
1 521488 AC/DC power supply 0...12 V/3 A LD
1 500421  4  Connecting lead 19 A, 50 cm, red LD
1 500422  4  Connecting lead 19 A, 50 cm, blue LD
1 500441  4  Connecting lead 19 A, 100 cm, red LD
1 500442  4  Connecting lead 19 A, 100 cm, blue LD
1 64945  4  Tray, 552 mm x 459 mm x 48 mm LD
1 6747920  4  Sulfuric acid, diluted, approx. 2 N (= 10 %), 500 ml LD
GHS05 Warning H290 H315 H319

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) P3.2.5.1 Determining the Faraday constant
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