Identification of common gases

• Identification of common gases can be done using a burning splint held at the open end of a test tube, which creates a 'squeaky pop' sound when hydrogen burns rapidly.
• Another method for testing for hydrogen is to use a glowing splint inserted into a test tube of the gas, which relights in oxygen.
• Bubbling the gas through limewater (calcium hydroxide (aq)) will turn it milky (cloudy), indicating the presence of carbon dioxide.
• Damp litmus paper changes color when put into chlorine gas, turning white when bleached.