C8-Chemical analysis

• Test for chlorine

  -Test with blue litmus paper

  -If it comes into contact with chlorine ,it becomes bleached

  -This may turn red beforehand as a solution of chlorine is acidic.
• Test for oxygen

  -Put a glowing splint in a tube that contains oxygen

  -If oxygen is present, it will relight the glowing splint.
• Test for carbon dioxide

  -Mix the solution with limewater (calcium hydroxide)

  -If CO2 is present, the new solution turns cloudy.
• Test for hydrogen

  -Put a burning splint in a tube that may contain hydrogen

  -If there is a popping/squeaking sound, hydrogen is present.

  -This sound cones from the hydrogen reacting quickly with the oxygen in the air to form water.
• Rf value equation

  Rf= distance travelled by substance/distance travelled by solvent
• What is the Rf value in a chromatogram?

  The ratio between the distance travelled by the solute and the distance travelled by the solvent