How does a combustion train work Determine Empirical Formula | Gen Chem

Explaining the parts, process, and use of a combustion train. One analytical method used to determine the empirical formula of a hydrocarbon is the use of a combustion train. We can use it to determine the ratio of carbon to hydrogen in the compound and therefore will be able to determine the empirical formula of the hydrocarbon. General formula for combustion: CxHy + O2 → CO2 + H2O Parts: - Oxygen flow (because we need oxygen gas for a combustion reaction) - Sample chamber - Heaters - A chamber with a drying agent to absorb the water produced from the combustion - A chamber that absorbs the CO2 produced from the combustion (some strong base and calcium chloride CaCl2) Process 1) Have our unknown hydrocarbon 2) Weight it 3) Weigh the two absorption chambers before the reaction 4) Sample is placed in the chamber where it is burned with oxygen flowing 5) Sample combustion produces water and CO2 gas 6) The CO2 and water flow through the chamber with desiccant and the water from the reaction is absorbed 7) The CO2 continues to flow and is absorbed by the mix of strong base and calcium chloride 8) These two chambers are then weighed after the reaction 9) Subtract the original weights of the chambers to get the weights of the water and carbon dioxide produced from the reaction Content based on Principles of Modern Chemistry by Oxtoby, ed. 7.

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