LAB 5

• Ch4 was prepared in the lab by heating a mixture of fused sodium acetate and soda lime
• Fused sodium acetate

  Anhydrous acetate
• Sodalime is the combination of NaOH and CaO in the ratio of 3:1
• Reaction involved in the preparation of CH4 is Decarboxylation
• Decarboxylation is the removal of CO2 from sodium acetate
• CH³C00Na +NaOH

  Fused sodium acetate
• Merhod of collecting Methane


  Water H2O displacement method
• Methane is slightly soluble inwater
• Methane is lighter than air thats why the testtube must be covered at once before removing from water
• Physical Properties

  Slightly soluble in H2O

  Lighter than air

  Odorless when pure

  With characteristics when impure

  Colorless because methane does not emit light
• Chemical properties

  Flammability or Combustion test

  Yellowish flame due to lack of oxygen (incomplete combustion)

  Bluish flame with sufficient oxygen ( complete combustion )
• Bromine test

  Reddish brown color of water H20 was retained upon adding bromine water to the methane
• After blowing the mouth of the testtube and putting blue litmus paper, the blue litmus paper became red due to the acidity of HBr
• Addition of lime water is to test CO2
• Reaction in bromine tes was- halogenation, bromination substitution
• Test for unsaturation

  Bromine test

  In the presence of double or triple bond, the reddish brown color of bromine will disappear

  Von Baeyer Test

  Adding the KmnO4 to the alkane or alkene will cause the decolorization of the KmnO4
• Oxidizing agent

  Bromine water

  Postaasium Permanganate
• Oxidation process

  Von baeyer test

  Bromine test
• Ch4 did not decolorize

  Kmno4 Was not anle to oxidize Ch4 because it is not an alkene or alkyne