3B SCIENTIFIC® PHYSICS |
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U14332 Hofmann water-decomposition apparatus
Instruction sheet
11/03 ALF
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1 Base-plate with stand rod |
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2 Platinum electrodes |
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3 GL-18 screw fitting |
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4 GL-14 screw fitting |
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5 Gas collection tubes |
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6 Securing plate |
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7 Ground stopcock |
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8 Plastic hose |
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9 Stand ring |
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bl Leveling bulb |
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1
The purpose of the water-decomposition is for the electrolysis of water (converting electrical energy into chemical energy), quantitative determination of the resulting gases and confirmation of Faraday’s laws.
1.Safety instructions
•Since the conductivity of distilled water is too low, electrolysis is carried out using dilute sulfuric acid (c =1 mol/l approx.).
•Carefully add the sulfuric acid to the water while stirring. Never do this the other way round.
•Wear protective goggles when mixing the solution and when releasing the gases.
•Students should always be informed of the dangers of the chemicals needed for the experiment.
•Caution. Any acid that escapes can cause irreparable stains and holes in clothing.
•Be careful when taking the glass tubing off its securing plate.
•Do not subject the glass components of the waterdecomposition apparatus to mechanical stress.
2.Description, technical data
The water-decomposition apparatus consists of an H- shaped section of glass tubing attached to a securing plate fixed to a stand rod that rests on a base-plate. The glass section involves two gas collection tubes each
with a measuring scale. At the top of each tube there is a ground stopcock. Two platinum electrodes are secured at the lower ends via GL-18 screw fittings. A flexible plastic hose leads to a leveling bulb for equalising the pressure in the collection tubes.
Dimensions:
Water-decomposition apparatus:
Height: |
800 mm approx. |
Width: |
150 mm |
Base-plate: |
250 mm x 160 mm |
Rod: |
750 mm x 12 mm Ø |
Securing plate: |
120 mm x 110 mm |
Gas collection tubes: |
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Height: |
510 mm |
Width: |
150 mm |
Tube diameter: |
19 mm |
Scale: |
50 ml each with 0.2 ml divisions |
Leveling bulb: |
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Volume: |
250 ml |
2.1 Scope of delivery:
1 Glass section with gas collection tubes
1 Base-plate with stand rod and securing plate 1 Pair of platinum electrodes with 4-mm sockets 1 Leveling bulb with plastic hose
1 Stand ring to hold the leveling bulb
1 Universal sleeve
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