Chemical Analysis

Chromatography Required Practical

Testing for Gases


  • The test for hydrogen uses a burning splint held at the open end of a test tube of the gas. Hydrogen burns rapidly with a pop sound.


  • The test for oxygen uses a glowing splint inserted into a test tube of the gas. The splint relights in oxygen.

Carbon Dioxide

  • The test for carbon dioxide uses an aqueous solution of calcium hydroxide (lime water). When carbon dioxide is shaken with or bubbled through limewater the limewater turns milky (cloudy).


  • The test for chlorine uses litmus paper. When damp litmus paper is put into chlorine gas the litmus paper is bleached and turns white.