A Hofmann voltameter is an apparatus for electrolysing water, invented by August Wilhelm von Hofmann in 1866. It consists of three joined upright cylinders, usually glass.

What is Hoffman Voltameter used for?

The Hoffman's Voltameter is used for demonstrating the chemical composition of water by volume and the electrochemical equivalent of hydrogen by electrolysis of water.

What happens in a Voltameter?

It consists of two silver plates in a solution of silver nitrate. When current is flowing, silver dissolves at the anode and is deposited at the cathode. The cathode is initially massed, current is passed for a measured time and the cathode is massed again.