The Thermal Decomposition of Sodium Hydrogen Carbonate
When Sodium Hydrogen Carbonate (NaHCO3) is heated, Carbon dioxide and water are given off to leave a white powder. The aim is to find the equations for this reaction.
The experiment will prove which of the equations below is true. It will tell us whether Sodium Carbonate is produced or Sodium Oxide.
2NaHCO3 Na2CO3 + CO2 + H2O
2NaHCO3 Na2O + 2CO2 + H2O
Independent: Original Mass of NaHCO3
Dependant: Final Mass of the Residue
Controlled: Mass lost
First we measured and recorded the weight of a crucible and its lid. Then we added some Sodium Hydrogen Carbonate into the crucible and measured and recorded the values again. After, we set up the apparatus as shown in Fig.1. We left the crucible over the fire for five minutes. Then we took it off and measured the weight of the Crucible and the residue. We then put it back on the fire to see if the weight would reduce further. This was repeated three times untill the compound was no longer reducing in weight.
Crucible and Lid
Crucible, Lid and NaHCO3
Crucible, Lid and Residue
2NaHCO3 Na2O + 2CO2 + H2O 168
2NaHCO3 Na2CO3 + CO2 + H2O 168
The aim of the experiment was to find out which of the equations for the thermal decomposition on Sodium Hydrogen Carbonate is correct. This can be calculated by simply taking the Molecular formula of the reactants and products, then finding the ratio to one gram of the reactant. To find the mass of product I merely multiplied all the values by the original mass of Sodium Hydrogen...
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