Mayalab Instrument

Mayalab Hoffman Voltameter is a classic laboratory apparatus used to demonstrate the electrolysis of water and to study the composition of gases released during the process.

Features:

• Material: Made from high-quality borosilicate glass for excellent chemical and thermal resistance.

• Capacity: Each graduated tube has a gas-collecting capacity of 50 ml.

• Electrodes: Supplied with platinum or carbon electrodes (as per requirement).

• Graduated Tubes: Precisely calibrated for accurate measurement of gas volumes.

• Stopcocks: Fitted with leak-proof glass stopcocks for easy gas collection and transfer.

• Heavy Stand: Mounted on a sturdy support frame for stable use in laboratory demonstrations.

Applications:

• Electrolysis of water into hydrogen and oxygen.

• Demonstrating Faraday’s laws of electrolysis.

• Educational tool for chemistry and physics experiments.

• Gas collection and analysis in teaching laboratories.

The Hoffman Electrolysis Apparatus is a laboratory device used to demonstrate the electrolysis of water and to study the decomposition of water into hydrogen and oxygen gases using an electric current. It is widely used in educational institutions for teaching fundamental concepts of electrochemistry, redox reactions, and gas collection techniques.

• Material: Made of borosilicate glass for high chemical and thermal resistance.

• Structure: Comprises three vertical glass tubes – a central reservoir and two outer graduated gas-collecting tubes.

• Electrodes: Usually fitted with platinum or graphite electrodes at the bottom of the outer tubes.

• Graduated Tubes: Each outer tube is graduated to measure the volume of gases collected.

• Gas Collection: Hydrogen collects at the cathode, oxygen at the anode (in a 2:1 volume ratio).

• Stopcocks: Fitted with stopcocks or rubber stoppers to release collected gases safely.

When a DC electric current is passed through the acidulated (with dilute sulfuric acid or sodium hydroxide) water in the central reservoir, water molecules break down into hydrogen and oxygen gases.

• At the cathode (−): 2H++2e−→H2↑2H^+ + 2e^- → H_2 \uparrow2H++2e−→H2​↑

• At the anode (+): 2H2O→O2↑+4H++4e−2H_2O → O_2 \uparrow + 4H^+ + 4e^-2H2​O→O2​↑+4H++4e−

• Demonstration of electrolysis and Faraday’s laws.

• Study of volumetric gas evolution.

• Understanding stoichiometry and molar gas ratios.

• Ideal for chemistry labs, science exhibitions, and academic experiments.