How to check hydrogen gas purity

Method ( By Orsat apparatus)

Firstly remove all the air /H2 gas from the graduated cylinder by lifting up the water bottle.

Then take H2 gas in a cylinder up to the 100 mark the level of 💦 water.

Laying in lifting bottle 🍼.

Now pass the H2 gas 3-4 times through the paragallou solution.

Original level is mentioned.

Then allow the gas come back to the cylinder and compare with water in the bottle is original.

If difference in the level its means indicate impurities

Then the crosspounding reading on graduated cylinder directly indicate the purity of gas.