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

1. Set the apparatus up vertically using a clamp and stand.
2. Fill with acidified water (for platinum electrodes) or suitable alternative electrolyte depending on the electrode type.
3. Connect to a 12 V DC power supply.
4. Observe the formation and collection of hydrogen and oxygen gases.
5. 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

Key Features

• High‑quality 3.3 borosilicate glass construction
• Dual‑electrode system: platinum for acidified water, carbon for chloride solutions
• Clear measurement with 0.2 ml graduations
• Ideal for demonstrating electrolysis, gas laws, and chemical composition
• Suitable for repeated use in schools and colleges

Ideal for School Science Lessons

Perfect for KS4–KS5 chemistry, this Hoffman Voltameter supports:

• Demonstrating the electrolysis of water
• Investigating the composition of water by gas volume
• Exploring oxidation and reduction processes
• Understanding ion movement, electrodes, and electrolytes
• Required practicals related to electrochemical reactions

Robust, accurate, and classroom‑ready, this Hoffman Electrolysis Apparatus is an essential piece of equipment for teaching electrochemistry in secondary and post‑16 science.