The Leclanché cell

The Leclanché cell
The Leclanché cell

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The Leclanché cell is a zinc/coal battery. Here the negative pole is the steel-jacketed battery cup made of zinc. The positive pole is formed by a graphite bar which is surrounded by a mixture of graphite powder and manganese dioxide. An ammonium chloride solution (20 %) thickened by starch serves as the electrolyte. This prevents the cell from spilling out.

Experiment C4.4.4.2 demonstrates the principle of this dry cell. The voltage of the cell is first measured with the electrochemistry demonstration unit in the no-load condition. The Leclanché cell is then connected to the motor, and the voltage and current are measured simultaneously.

Reaction at the negative pole:

Reaction at the positive pole:

Reaction in the electrolyte solution:

Components of equipment sets

1 6644071  8  Electrochemistry demonstration unit, CPS LD
1 666425  4  Panel frame C50, two-level, for CPS LD
1 666472  4  Table for electrochemistry, CPS LD
1 664401  4  Electrochemistry accessories set LD
2 664132  4  Beaker, Boro3.3, 600 ml, squat LD
3 602023  4  Beaker, Boro 3.3, 150 ml, squat LD
1 665217  4  Glass stirring rod, 500 mm x 8 mm diam., set of 10 LD
1 ADAHCB602H Precision Balance, 600 g /0,01g, with USB interface LD
1 665754  4  Measuring cylinder 100 ml, with plastic base LD
1 665751  4  Measuring cylinder 10 ml, with plastic base LD
1 6045662 Spatula, double ended, 210 mm LD
1 666584  4  Filtration stand for two funnels LD
1 665005  4  Funnel, Boro 3.3, 100 mm diam. LD
1 609082  4  Folded filter 125mmØ Typ: 595 LD
1 6755100  4  Zinc chloride, dry, 50 g LD
GHS05GHS07GHS09 H302 H314 H335 H410
1 6704000  4  Ammonium chloride, 100 g LD
GHS07 H302 H319
1 6732200  4  Manganese(IV) oxide, 100 g LD
GHS03GHS07 H272 H302 H332
1 6721500  4  Graphite, 50 g LD
1 6738400  4  Sodium hydroxide solution, diluted, aprox. 2 M, 500 ml LD
GHS05 H314 H290
1 6753400  4  Water, pure, 1 l LD
1 661242  4  Wash bottle, PE, 250 ml LD
1 6713820  4  Carboxymethylcellulose, 100g LD

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) C4.4.4.2a The Leclanché cell with Electrochemistry demonstration unit
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