chem 132 lab 2

chem 132 lab 2 - chm 132L Introduction: The purpose of this...

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chm 132L Introduction: The purpose of this lab was to a) determine the heats of neutralization for two weak acids, b) determine the corresponding K a ’s for each, and c) use these measurements to determine ΔG°. The only change to the original procedure is that two separate thermometers were used, instead of only one. The difference in temperature between them was found to be .5°C. Data and Observations: Part I - Determination of the Calorimeter Constant: Temperatures are steady and changes are moderate. The stagnant measurements from the cold water are probably due to the fact that the water was initially very close to room temperature. Temperature of Hot Water Temperature of Cold Water Temp. of Hot + Cold Water 0 sec 36.8°C 20.3 29.0 30 36.6 20.4 28.5 60 36.5 20.4 28.4 90 36.4 20.4 28.4 120 36.3 20.3 28.4 150 36.2 20.4 28.4 180 36.1 20.4 28.4 210 36.1 20.3 28.4 240 36.0 20.3 28.4 Sodium Hydroxide: 20.3°C Acetic Acid: 20.2°C Data Collected In first 10 seconds After 20.3 22.8 23.6 24.0 25.4
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Mixing: 25.8 26.2 26.5 26.6 27.2 Part 2- Determination of the Enthalpy Change: First Run: Second Run: Sodium Hydroxide: 20.3°C Acetic Acid: 20.2°C Data Collected In first 10 seconds After Mixing: 20.3 22.7 23.9 24.9 25.4 25.8
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chem 132 lab 2 - chm 132L Introduction: The purpose of this...

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