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Thermodynamics Enthalpy of Reaction and Hess's Law

Thermodynamics Enthalpy of Reaction and Hess's Law - Date...

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Date: October 8, 2010 Title: Thermodynamics – Enthalpy of Reaction and Hess’s Law Purpose: The purpose of this experiment is to verify Hess’s Law by conduction three acid-base reactions. The reactions have been chosen so that the third reaction equals the first reaction minus the second. To verify Hess’s Law, find the percent difference between the calculated and the measured values of ΔH for the third reaction. Using Hess’s Law gives the enthalpy change of reactions that are too slow or too hard to observe. Hypothesis: The hypothesis is that the measured enthalpy change of the third reaction will be approximately equal to the enthalpy change calculated from subtracting the first reaction from the second reaction. The reason for making such hypothesis is based on Hess’s Law, allowing known enthalpy values to be substituted into the target reaction's enthalpy change. Hess’s Law states that the enthalpy is the same regardless of the pathway.
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