Solution Calorimetry

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Calorimetry Lab...report (Chem 312)

The following report will consist of a collection of graphs and handwritten calculations with the following headings:

Introduction

"This report will presents results from a solution calorimetry lab activity involving the following reactions where NaOH is the limiting reagent:"

KOH or NaOH (s) --> NaOH (aq) (1)
KOH or NaOH (s) + HCl (aq) --> NaCl (aq) + H2O (l) (2)
KOH or NaOH (aq) + HCl (aq)--> NaCl (aq) + H2O (l) (3)
(YES...you may copy/paste these words/rxn into your lab report...this is all you need to have for your intro unless you wish to add more.)

Methods

Describe the setup and data collection

Results

Experimental data

1) Plot out (with axes labels in Igor) time vs temp data for the three reactions on a single graph.
2) As will be discussed in lab, annotate a single data set (on a different graph using a layout) to show how Tf and Ti were determined, and hence ΔT.
3) Show calculations to (hand written) to determine ΔH1, ΔH2, and ΔH3.

Theoretical Data

1) Use the ∆Hf to calculate theoretical values of ΔH1, ΔH2, and ΔH3.
2) Using the concept of Hess’ Law, use the theoretical values to show that ΔH1 + ΔH3 = ΔH3; include chemical reactions and how they are used to show that ΔH1 + ΔH3 = ΔH2.

Discussion

1) Discuss the relationship between experimental and theoretical values and indicate whether your experimental data “follows” Hess’ Law.
2) Discuss from a molecular-level why the ΔH1 < 0 (exothermic).
3) Discuss from a molecular-level why the ΔH3 < 0 (exothermic).

Conclusion

1) Comment of the quality of the experimental data.
2) Suggest sources of error in the experimental setup and potential ways to improve.