Description
Description
Hoffman Voltameter – Complete Electrolysis Apparatus (KS4+)
This Hoffman Voltameter is a high‑quality electrolysis apparatus suitable for KS4 and above, designed for demonstrating the electrolytic decomposition of water and exploring chemical composition through gas collection. Constructed from durable 3.3 borosilicate Labglass, the unit includes precision glass key stopcocks for accurate gas measurement and controlled release.
Supplied with both platinum electrodes (for acidified water) and carbon electrodes (for chloride‑containing solutions), the apparatus supports a wide range of electrochemical investigations. An instruction guide is included.
Note: A support stand with clamps and a 12 V DC power supply are required but not supplied.
What’s Included
Hoffman Electrolysis Apparatus (3.3 borosilicate glass)
2 × glass key stopcocks
2 × platinum electrodes with rubber stoppers
2 × carbon electrodes with rubber stoppers
Instruction guide
Supplied in a protective packing case
Apparatus Design
Two outer tubes, each 50 ml capacity, graduated in 0.2 ml increments
Central tube with 200 ml funnel‑shaped bulb
Electrodes fitted with rubber stoppers for secure positioning
Heavy‑duty construction ideal for frequent school use
How It Is Used
Set the apparatus up vertically using a clamp and stand.
Fill with acidified water (for platinum electrodes) or suitable alternative electrolyte depending on the electrode type.
Connect to a 12 V DC power supply.
Observe the formation and collection of hydrogen and oxygen gases.
Use lit splints to test the collected gases safely.
Chemicals required (not supplied):
Water
Sodium sulphate or potassium sulphate (molar solutions)
OR dilute sulphuric acid
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