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AP Chemistry – Lab 07 – Hess’s Law

Purpose

The goal of this lab is to verify Hess’s Law: if the sum of two chemical reactions is a third reaction then the sum of the two reaction enthalpies is the enthalpy of the third.

Procedure Notes [LINK]

  • make sure that the calorimeter is clean and dry before each use
  • do not contaminate the solutions with each other as that will distory the results
  • any acid spill – neutralize with baking soda
  • any base spill – neutralize with vinegar
  • the smell of ammonia is powerful – be very careful and do not directly smell
  • be sure and ask how to be coached on using the GLX to save files
Data Processing
  • be sure and determine the heat capacity of the calorimeter
  • determine the change in enthalpy for each reaction (per mole)
  • determine the change in enthalpy for the unknown reaction (per mole) using your data
  • calculate the percent difference between the theoretical and experimental values
  • be sure and complete pre-lab if you did not already do so
Posting Information
  • make sure the data, calculations, graphs are in the LNB
  • the final data, calcs, graphs, results should be posted to Tumblr in polished, final form

Information

This entry was posted on November 9, 2011 by in Chemistry, CLab, SHP and tagged , , .

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