Hoffman Voltameter
Product Code : LSK-EAE-11122
Hoffman Voltameter (SKU LSK-EAE-11122), also written Hofmann voltameter, is a glass electrolysis apparatus that shows water splitting into two volumes of hydrogen and one volume of oxygen. Its two connected limbs are each graduated to 50 ml, with removable carbon electrodes, for school demonstrations and college electrochemistry labs. Science Lab Supplies manufactures the apparatus at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and supplies schools, colleges, tender contractors and distributors directly.
Specifications
Each specification is listed in the table below. In short, the glass unit has two connected limbs, each graduated 50 x 0.2 ml and fitted with a stopcock, joined through a tube to a funnel-shaped reservoir bulb, with removable carbon electrodes for passing current through the water.
| Specification | Value |
|---|---|
| SKU | LSK-EAE-11122 |
| Demonstrates | Water consists of 2 volumes of hydrogen to 1 volume of oxygen |
| Construction | Glass unit with two connected limbs |
| Limb capacity | 50 ml each |
| Graduation | 50 x 0.2 ml on each limb |
| Stopcocks | Provided on the limbs |
| Reservoir | Funnel-shaped reservoir bulb with connecting tube |
| Electrodes | Carbon, removable |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Hoffman Voltameter
The voltameter collects the gases from electrolysis of water in separate graduated limbs, so students can read their volumes and see the 2:1 ratio of hydrogen to oxygen. It is standard physics lab equipment in India for electrolysis demonstrations, matching Class 10 chemical-reaction topics and Class 12 and B.Sc. electrochemistry.
- Class 10 science: electrolysis of water as a decomposition reaction, collecting hydrogen and oxygen in the two limbs.
- Showing that the volume of hydrogen collected is twice that of oxygen, confirming the composition of water.
- Class 12 and B.Sc.: relating gas volumes to the charge passed, using a DC source such as the Electronics Lab Battery Eliminator 2A.
- Clamping the glass unit on a Hoffman Voltameter Stand, a metal stand with a 600 mm rod and support clamp.
Hydrogen is flammable: keep flames away from the stopcocks unless a teacher is running a controlled gas test, and handle any chemical added to the water as its safety sheet directs.
Standard Scope of Supply
The set consists of the glass voltameter unit, with its two graduated 50 ml limbs, stopcocks, connecting tube and funnel-shaped reservoir bulb, and the removable carbon electrodes. A stand, a DC power supply and the electrolyte are not included and can be quoted separately.
Packing, MOQ and Lead Time
You can ask for a quotation for one voltameter for a teacher demonstration or for several for group work. Science Lab Supplies states packing, delivery time and price for the chosen number on the quotation, and the stand and power supply can be added to it.
Science Lab Supplies has an Importer-Exporter Code, so it can ship to buyers in Zambia, Rwanda, South Africa, Qatar, Sri Lanka and Vietnam. Contact the team through the contact page, list items in the enquiry cart, or follow the lab tender page for tenders.
Frequently Asked Questions
What does the Hoffman voltameter demonstrate?
It demonstrates that water consists of two volumes of hydrogen and one volume of oxygen. Passing direct current through the water between the carbon electrodes releases the gases, which collect in the two graduated limbs.
What graduation do the limbs have?
Each of the two connected limbs holds 50 ml and is graduated 50 x 0.2 ml, so gas volumes can be read to 0.2 ml. Stopcocks on the limbs let the collected gases be released after reading.
Is it safe for classroom use?
It can be used safely under teacher supervision. Hydrogen and oxygen are produced, so keep flames away, work at low DC voltage, and clamp the glass unit securely to avoid breakage.
Is Science Lab Supplies the manufacturer or a trader?
Science Lab Supplies is the manufacturer. The voltameter is produced at its factory in Saha, Ambala, India, and laboratories receive the quotation straight from the factory with no trader involved.
Related Electrolysis Apparatus
These Chemistry Lab items cover other ways to run water and salt electrolysis, plus electrodes for electrochemistry set-ups. They complement this voltameter from the Electrical and Electronics range, and any of them can go on the same quotation for an electrochemistry bench.
- Hoffman Voltameter With Electrodes — limbs of about 50 ml with 2 carbon and 2 platinum electrodes; needs a 12 V supply.
- Apparatus for Water Electrolysis (Hoffman Voltmeter) — three glass tubes, 600 mm high, with ground glass taps.
- Voltameter — platinum electrodes on a base with two graduated 10 ml test tubes.
- Electrolysis Kit — insulated stainless steel electrodes and rubber gaskets; glassware not included.
- Apparatus for the Electrolysis of Salts — 15 mm U-tube with a 60 mm graphite electrode and rubber stopper.
- Electrode Rod Carbon Voltameter — 100 x 10 mm carbon rod in a glass tube with terminal.
- Electrode Carbon Rod With Brass Terminal — graphite electrode for electrolysis experiments.
Browse the full Electrical and Electronics range, the Chemistry Lab range for electrochemistry apparatus, or all physics lab equipment.
Last updated: 9 October 2026
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