Evaluating An Enthalpy Change That Cannot Be Measured Directly. Essay

Evaluating An Enthalpy Change That Cannot Be Measured Directly.Dr. Watson.Introduction.We were told that sodium hydrogencarbonate decomposes on heating to give sodiumcarbonate, piddle and carbon dioxide as shown in the equation below-2NaHCO3(s)-------- Na2CO3 (s) + H2O (l) + CO2 (g) = DeltaH1This was stipulation as deltaH1 and we had to calculate as part of the experiment.This however cannot be calculated directly, but can be found using the enthalpychanges from two other reactions. These being that of sodium hydrogencarbonateand hydrochloric acid and also sodium carbonate and hydrochloric acid.We were given a list of instructions in how to carry out the experiment, whichare given later.List of Apparatus Used.1 x 500ml Beaker. 1 x Thermometer(-10 to 50oC). 1 x Polystyrene Cup. 1 xWeighing Balance. 1 x Weighing Bottle. 10 grams of Sodium Hydrogencarbonate. 10grams of Sodium Carbonate. A bottle of 2 molar(a) HCL.Diagram.Method.Three grams of sodium hydrogen carbonate was weighted out accurately using aweighting bottle and a balance. Then thirty centimetres cubed of 2 molar HCL wasmeasured using a measuring cylinder. The acid was then placed into thepolystyrene cup and its temperature was taken and recorded using the thermometer.The pre-weighted sodium hydrogencarbonate was then added to the solution, andthe lowest temperature was recorded.The contents of the cup were then emptied out and the cup was washed out withwate...